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                    - Tom, can you help me _______ the homework to your classmates?-Of course. I’d love to.
 - We must______ using plastic bags in order to protect our earth..
 - English is too hard for me to study well. I don’t want to learn it any more.-Don’t . It is useful in the future.
 - Scientists are trying to ways to treat the terrible disease called H7N9.
 - During the earthquake, many buildings fell down. But the people there didn’t hope.
 - My grandfather was badly ill, so we asked him _________ smoking.
 - My father has decided to ________ smoking.—That’s good news for us.
 - It’s time for test. Be quiet, please. I’m going to _____ your test papers.
 - Don’thope. I’m sure things will be better.
 - Mom, I have great trouble with my math. —Never __________ and you will learn it well.