It was cold, Dr. Mason was tired and he didn’t _________ getting out of his sleeping bag to see if Jackstraw was right.

After listening to the noise the engine of the plane was making, he realized that it _________.

Balto was always able to control the dog, even when they were unwilling and _______.

Only after lying in his sleeping bag for 15 minutes, had he ________ creating a little warmth.

As soon as Mason jumped into the cabin, he looked around and saw the second pilot who had dreadful_______.

When they found the radio operator in the plane, he was still alive but he was badly injured and was _________heavily.

If the pilots knew that the crash ___________, why weren’t the passengers wearing seatbelts?

It took them five minutes to get to the cabin, and once there, they _______the oil lamps and started to examine the passengers.

Dr. Mason looked at the dead radio operator and knew the cause of his death, but he ________ the passengers.

Corazzini said he was flying to Scotland to ________ a new tractor company.

Suddenly everybody had a question and Mason put up his hands in protest-he would answer all their questions, but _________

Corazzini shook his portable radio, but it was a total ________

Margaret said nothing about the bruise-she didn’t want to ______Mason.

Jackstraw looked fresh and fully ________, and started melting ice on the stove.

They threw a coin to see who would sleep on the floor and Corazzini accepted________

Mason was lying in his sleeping bag and he was pleased to notice that he managed to create a little __________inside it.

Before they could leave for long journey, they had to go back to the airplane and get everyone’s _________.

It was dark and if the pilot did not see the small ice-hills, he could easily _______ them.

When the plane landed and the saw no sign of fire anywhere, they breathed with_______.

Jackstraw who was strong and fit, needed no ________in jumping into the cabin.

They were only nine passengers and it was surprising that almost all were _______although they were anxious.

The Reverend said a few words over the ________when they buried the radio operator.

The stewardess said that she knocked the table and the transmitter ________.

The stewardess was sitting by the radio operator, she was pale and ________ violently.

Jackstraw, who _________ early, lit the oil lamp and made some coffee.

Dr. Mason knew who was Mrs. Dansby-Gregg was, but he________ he had never seen her.

The man who promised Mason to get another radio, looked like someone who could _______ any solution.

If they stayed in the cabin, they would ________to death because there wasn’t enough food for all.

Margaret couldn’t work any more-her back was hurt and she ________.

The stewardess __________when she realized that the radio operator was dead. It wasn’t particularly loud, but it had a frightening quality.

Mason heard a sound and __________behind a seat quickly.

To kill the radio operator, somebody used a pillow to stop him _________.

Mrs. Dansby-Gregg was insensitive and _______. She only thought about herself.

Dr. Mason decided to ______everyone _____guns, but he didn’t find any.

Jackstraw, who had a lot of experience, was studying the ice-cap looking for changes in the snow which could _______him of danger.

Mahler was a Russian Jew who had been ________to escape from his country.

Mason looked at the card which Mahler took out of his pocket, ________it and gave it back to Malher.

Mahler didn’t say anything about his condition because he knew that they had other problems _________.

The scientists announced that they were going to travel at top speed without stopping and asked the passengers if they had any ________.

The Northern Light were very beautiful but they could _________ making the radio reception difficult.

After some time, all the passengers and also the scientists were ___________hunger, cold and lack of sleep.

Mahler was _________rapidly and he had to get some insulin urgently.

When the radio was finally repaired, they, ________ Hillcrest who told them that he was coming after them.

The travellers were moving very slowly to give Hillcrest the chance _________them.

The criminals __________their cleverness when they discovered that Mason made contact with Hillcrest.

When Mason realized that he couldn’t see the snow sticks, he
________his stupidity.

The criminal knew that shooting Dr. Mason would have been a stupid way of_________him, so he hid the snow sticks.

The scientists knew that the killer was amongst them, but they had no ________.

Mason__________ the stewardess to the kitchen area where he accused her of drugging the passengers.

When Mason understood that Margaret was innocent, he asked her _________ him.

The passengers were __________to Arctic conditions but they knew that they couldn’t stay in the cabin.

Only one person seemed to be _______: they had no doubts that Marie LeGarde was innocent.

In the darkness of the night they saw the plane: somebody ________it and it was burning!

They couldn’t see much so they used the ________to show them the right route.

All the passengers were worried about Mahler and ________ for his health.

In the morning, the engine was frozen, so they had _________

Dr. Mason finally ________to repair the radio so they knew that Hillcrest was coming after them.

Mason was becoming very worried about Margaret because he was _________ her.

One night, trying to contact Hillcrest, something heavy _________Mason on the forehead.

The _________sugar was found in the petrol: the criminals put it there.