Keys _______ opening the lock in the door.
A. used for B. are used C. are used to D. are used for
—I have never been to the Great wall.
—If you have an opportunity _______ there, you must take it.
A. to go B. to going C. going D. go
There was _____ woman in the room, sitting and looking at me in the dark.
A. a 80-year-old B. an 80-year-old C. a 80-years-old D. an 80-years-old
—How do you study English so well?
—I think _________ English movies is a good way to learn English.
A. watching B. learning C. reading D. looking
Don’t _______ the people who are in trouble.
A. help B. look after C. laugh at D. play with
---If I were you, I ________ study harder
A. had B. would C. did D . do
