Watching TV too much isn’t good _____ our health.
| A．to | B．with | C．for | D．at |
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 |