21. At first she was not accustomed to _________ in the new company, but eventually she managed to get through and get on well with her companions.
| A．working | B．works | C．worked | D．work |
______ your opinions are worth considering, the committee finds it unwise to place too much importance on them.
| A．As | B．Since | C．If | D．While |
He is confident, ______, in my opinion, is most important in modern society.
| A．who | B．that | C．which | D．what |
The team, ______ to climb the world’s second tallest mountain twice, finally decided to give up.
| A．having attempted | B．attempting |
| C．attempted | D．to attempt |
I ______ Peter with his work, but I had a lot of things to do myself.
| A．must have helped | B．should have helped |
| C．needn’t have helped | D．can’t have helped |
For a moment nothing happened; then______ from the excited audience.
| A．cheers came | B．did cheers com |
| C．cheers would come | D．came cheers |