At the beginning of the class, the noise of doors__________ could be heard many times.
| A．opened and closed |
| B．to be opened and closed |
| C．being opened and closed |
| D．to open and close |
All examinations are passed. This is the first time I ____ really relaxed.
| A．have felt | B．feel | C．had felt | D．was feeling |
She insisted that we ________ the source of the river and begin our journey there.
| A．find | B．found | C．would find | D．were to find |
_____ he is determined to do something, no one is able to make him ______.
| A．Once; give up | B．Although; give in |
| C．As long as; give out | D．If; give away |
Rather than ______ on a crowded bus, he always prefers _______a bicycle．
| A．ride; ride | B．riding; ride | C．ride; to ride | D．to ride; riding |
_____ of the students who took part in the military training is 450.
| A．A number | B．A lot | C．Lots | D．The number |