1 . 据说他们每年扔掉数百吨的垃圾。
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2 . It’s ________ (please) to have a walk after having lunch.

3 . It is very important for China to ________ (发展) the education.

4 . It’s ________ (possible) for him to work out that difficult Maths problem, because he is not good at it.

5 . It’s difficult to __________ (想象) you can’t use your hands easily.

6 . It’s difficult for me ________ (develop) a good habit.

7 . It is important for us _______ (protect) the Earth.

8 . It’s __________(不可能)for him to work out that difficult Maths problem since he is not good at it.