1) knew the rules
2) from this ..
3) must not
4) air pollution
5) Timber companies
6) looking forvard
7) driving lessons
8) have to
9) put your hand up
10) set off
11) forget
12) can/could
13) bio petrol
14) the first
15) can/could
16) in class
17) can i
18) drop litter
19) become extinct
20) fire extinguisher
1) b
2) c
3) b
4) b
5) a
6) a
7) c
8) a
9) b
10) a
1) why are you not stay at home?
2) the best thing you can do it's go to gym?
3) You should keep your money in bank?
4) what you really need is go on vacation?
5) how about go on language courses?