So many directors ________, the board meeting had to be put off.
| A．were absent | B．been absent |
| C．had been absent | D．being absent |
Mr. Smith is very happy because the cars made in his factory have never been ______.
| A．popular | B．more popular |
| C．most popular | D．the most popular |
If you are looking for a ______, you can make it when it is on sale.
| A．price | B．bargain | C．cost | D．bill |
He has given me so much help that I really want to do something for him ______.
| A．in turn | B．by turns |
| C．in return | D．in answer. |
You are asked to attend the meeting ______ in the hall this weekend.
| A．being held | B．to be held |
| C．held | D．holding |
It’s the protection for the trees ___ really matters, _____ how many trees are planted each year.
| A．what, other than | B．which, or rather |
| C．that, rather than | D．as, more than |