One learns a language by making mistakes and ______ them.
A. corrects
B. correct
C. to correct
D. correcting
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Birds’ singing is sometimes a warning to other birds ______ away.
A. to stay
B. staying
C. stayed
D. stay
Tony lent me the money, ______ that I’d do as much for him.
A. hoping
B. to hope
C. hoped
D. having hoped
With Father’s Day around the corner, I have taken some money out of the bank _______ presents for my dad.
A. buy
B. to buy
C. buying
D. to have bought
1张某因工作需要,要去某情报所查阅机密文件,应在单位开具
A. 介绍信
B. 证明信
C. 感谢信
D. 贺信