One way to ______ species under threat of extinction is to remove them to zoos and parks and feed them there.
| A．reserve | B．prevent | C．preserve | D．reduce |
-----Why? I didn’t get you on the phone.
-----We ________ football on the playground when you phoned.
| A．must be playing | B．must play |
| C．must have played | D．must have been playing |
----- Don’t look down upon Bob. He has his own advantages.
-----Oh, yes. __________ others are weak, he is strong.
| A．Where | B．Though | C．When | D．If |
Which record of his do they say _________best in their shop?
| A．sells | B．to sell | C．is sold | D．selling |
I’ll spend half of my holiday practicing English and ________ half learning
drawing.
| A．another | B．the other | C．other’s | D．other |
---Shall we go there by boat for a change?
---______.
| A．You say | B．It is up to you | C．It is hard to say | D．It is easy to tell |