A hot -air balloon floats because hot air is lighter than cool air.
A hot-air balloon consists of a basket in which the pilot and the crew stand, a gas burner and a large balloon. To take
off, you turn on the burner which heats the air inside the balloon. When the air gets hot, the balloon rises. To land, you
allow the air inside the balloon to cool. The relationship between To take off and To land is:

A Sequence

Pop videos are called PROMOS in Britain and CLIPS in the United States. They are similar to advertisements,
because their purpose is to promote and sell records; that is why they are very important for the music business.

There are two types of pop videos. One is called PERFORMANCE video, where the singers are shown singing and
playing their songs. The other type is the CONCEPTUAL video, where singers do not appear and caves, old docks or
exotic settings are shown as settings for their music. According to the text, an advertisement is a

Jenny told Peter she was sick. Read the advice he gave her.

"Well, Jenny, if you are sick, you shouldn't be smoking. You'd _________ go home and get some rest! Moreover, why
don't you get some medicine for yourself? I really think you need it!".

A. want

Jeannie calls Mr. Parker's radio program because she has a problem: "My aunt's husband drove her everywhere
before he died. Now, since she doesn't drive, she's bought herself a bicycle, but she's 71! She's my favorite aunt and I
think she should do something less energetic. What do you think?

Mr. Parker says to Jeannie:

1. It's better for her to ride a bike than to spend her days slumped in front of the TV;
2. or why don't you suggest that she trains slowly,
3. How about buying a bicycle yourself and going with her?
4. instead of trying to ride a lot right away