One of the first foreign expeditions _______ Mount Qomolangma arrived in Tibet in 1921.
| A．climbing | B．climbed | C．had climbed | D．to climb |
At first we were ______by his stories and tried to help him, but later we learnt he was telling lies.
| A．taken off | B．taken in |
| C．taken away | D．taken out |
_______, he went upstairs to sleep without supper.
| A．He was tired | B．As he was tired |
| C．Tired as was he | D．As tired as he was |
______ you may have, you should gather your courage to face the challenge.
| A．However a serious problem |
| B．What a serious problem |
| C．However serious a problem |
| D．What serious a problem |
That’s the factory _______we paid a visit last year.
| A．where | B．to which |
| C．which | D．that |
The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.
| A．after | B．before |
| C．since | D．when |