Experts have been warning _____ of the health risks caused by passive smoking.
| A．at a time | B．at one time | C．for some time | D．for the time |
Let’s paint one side of the paper red, and _____ side black.
| A．the other | B．another | C．the others | D．one another |
We should keep trying, and I think our efforts will finally _____.
| A．pay out | B．pay back | C．pay for | D．pay off |
I _____ up early when I was in high school, but now I _____ up around 7:00 am.
| A．used to get; used to get | B．am used to getting; used to get |
| C．used to get; am used to getting | D．am used to getting; am used to getting |
What do you think should _____ the shopping list?
| A．add to | B．be added to | C．be adding to | D．have added to |
The last factory ______ I am going to visit is the place _____ my mother worked five years ago.
| A．which; where | B．that; where | C．where; where | D．that; which |