It __________ be the vocabulary that caused you the problem in the exercise because you know a lot of words.
| A．may |
| B．couldn't |
| C．should |
| D．needn't |
____ sat down for a rest the door bell rang.
| A．Hardly I had; when | B．Hardly I had; than |
| C．Hardly had I; than | D．Hardly had I， when |
Human facial expressions differ from those of animals in the degree ___ ___ they can be controlled on purpose.
| A．with which | B．to which |
| C．of which | D．for which |
Chan’s restaurant on Baker Street, ___ ___ used to be poorly run, is now a successful business.
| A．that | B．which |
| C．who | D．where |
Those successful deaf dancers think that dancing is an activity ___ ___ sight matters more than hearing.
| A．when | B．whose |
| C．which | D．where |
It is reported that two schools, ___ ___ are being built in my hometown, will open next year.
| A．they both | B．which both |
| C．both of them | D．both of which |