UNIT 9
1: 2 have to 3 can 4 don’t have to
5 can’t 6 have to
2: 2 –, a 3 a, – 4 –, – 5 the, the 6
the 7 a
3: 2 easier 3 safer 4 unhealthy
5 greener 6 convenient 7
comfortable
4: 2 a train 3 feet 4 a car 5 foot
6 a car 7 a plane 8 a taxi 9 a bike
5: 2 d) 3 f) 4 c) 5 b)/g) 6 b)/g) 7 a)
6: 2 problem 3 afraid 4 broke 5
about 6 ten 7 terribly 8 train 9
don’t
10 hear 11 happen
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