Collecting stamps as a hobby___________ increasingly popular during the past fifty years.
| A．becomes | B．became | C．has become | D．had become |
Great changes have taken place in that school. It is no longer ___ it was 20 years ago, ___ it was so poorly equipped.
| A．what, when | B．that, which | C．what, which | D．which, that |
The doctor recommend he _________ a few more days in hospital.
| A．stays | B．to stay | C．stay | D．would stay |
—I suggest we set up an out-of-class club.
—Great! That’s exactly what I ______.
| A．was thinking | B．think | C．had thought | D．will think |
Can you imagine what problem may ________ when human beings are cloned?
| A．raise | B．cause | C．arise | D．lead |
The young actress looked so charming in her beautiful dress that we took pictures with her.
| A．a great many of | B．masses of | C．the number of | D．a large amount of |