ⅰ.单项填空
1. water shortage will become a hot issue all over the world, if water becomes increasingly scarce in decades ______.
a. coming b. to come
c. having come d. to be coming
2. it's not easy to learn english well. ______ as much as possible is necessary.
a. reading b. read
c. having read d. to have read
3. — why are the students working so hard these days?
— ______ ready for the coming entrance examination.
a. got b. get
c. getting d. to get
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