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2 We
3 We
4 You
5 He
6 Bobby
7 They
should
save energy. We shouldn't
waste energy.3 We
shouldn't
drive too much. We should
take the bus or the metro to school.4 You
shouldn't
cut down too many trees. You should
plant more trees.5 He
should
be quiet in the library. He shouldn't
eat or drink there.6 Bobby
shouldn't
litter. He should
put rubbish in the bin.7 They
should
use cloth (布) bags. They shouldn't
use too many plastic bags.
答案：
2 should; shouldn't
3 shouldn't; should
4 shouldn't; should
5 should; shouldn't
6 shouldn't; should
7 should; shouldn't
3 shouldn't; should
4 shouldn't; should
5 should; shouldn't
6 shouldn't; should
7 should; shouldn't
1 many, is, not, places, water, in, there, much
2 messy, makes, the, what, bedroom
3 box, to, reuse, make, paper, a, can, I
4 bookshop, he, the, not, smoke, in, should
5 air, help, clean, keep, the, trees
There is not much water in many places.
2 messy, makes, the, what, bedroom
What makes the bedroom messy?
3 box, to, reuse, make, paper, a, can, I
I can reuse paper to make a box.
4 bookshop, he, the, not, smoke, in, should
He should not smoke in the bookshop.
5 air, help, clean, keep, the, trees
Trees help keep the air clean.
答案：
1. There is not much water in many places.
2. What makes the bedroom messy?
3. I can reuse paper to make a box.
4. He should not smoke in the bookshop.
5. Trees help keep the air clean.
2. What makes the bedroom messy?
3. I can reuse paper to make a box.
4. He should not smoke in the bookshop.
5. Trees help keep the air clean.
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