1. Birds’ singing is sometimes a warning to other birds ______ away.
A. to stay
B. staying
C. stayed
D. stay
2. My father did not go to New York, the doctor suggested that he ______ there.
A. not went
B. won’t go
C. not go
D. not to go
3. To ______ the living standard of the people has been the main task of the government over the past decades.
A. raise
B. rise
C. arise
D. arouse
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