Connecting words

a. I don't drive, [blank_start]although[blank_end] both of my sisters do. b. I hate cars. They're too expensive and [blank_start]what's more[blank_end], they pollute our planet. c. I was late [blank_start]due to[blank_end] a terrible traffic jam on the highway. d. To begin making pizza, [blank_start]first[blank_end] prepare the pizza base and then choose your topping. e. I leave home late every morning. [blank_start]therefore[blank_end], I'm always late to my class.