Plants _________carbon dioxide and at the same time _________oxygen. So we may put some in our bedrooms to purify the air.
| A．take in, give out | B．take up, give off |
| C．take over, give in | D．take off, give up |
_______ interests me most is the natural beauty of nature.
| A．That | B．Which | C．it | D．What |
With his work ________, he went home happily.
| A．finishing | B．to finish | C．finished | D．had finished |
. _______doesn’t matter much that they won’t come tomorrow.
| A．There | B．What | C．That | D．It |
Very loud noises in the factory can ___________people mad
A. make B keep C. cause D. drive
We have no idea at all________.
A. where did he go B where he has gone
C. which place he has gone D. where has he gone