Scientists are trying their best to_______ ways to treat the terrible disease caused by Ebola(埃博拉）．
| A．come up with | B．look forward to |
| C．talk about | D．give up |
My father seldom has sports in the early morning,________?
| A．has he | B．hasn’t he | C．does he | D．doesn’t he |
- Shall I tell Shirley the good news?
-No, you________. I’ve told her already.
| A．can’t | B．shouldn’t | C．mustn’t | D．needn’t |
Oliver still bought some goldfish ________he found it difficult to raise them.
| A．because | B．since | C．though | D．until |
The writer told us that he________ a great number of short stories in the last few years.
| A．wrote | B．was written | C．has written | D．had written |
By the end of 2011, all of China’s public art galleries(画廊)________free to enter.
| A．have been | B．had been | C．will be | D．would be |