Don’t be too hard ________ David; he is only five years old.
| A．on | B．to | C．about | D．with |
The science of computer, rapid progress has been made in recent years，plays a very important role in our daily life．
| A．from which | B．in which |
| C．with which | D．to which |
— How long do you suppose it is ______ he arrived here？
— No more than half a week.
| A．when | B．before |
| C．after | D．since |
The Foreign Secretary's remarks clarify an _____________ statement issued earlier this week.
| A．ambitious | B．Ambiguous |
| C．amateur | D．arbitrary |
A lot of language learning, ________ has been discovered, is happening in the first year of life, so parents should talk much to their children during that period.
| A．as | B．it | C．which | D．this |
— Could you meet me at the airport?
— I'd like to，but I'm a fraid I ______ a very important meeting when you return.
| A．am attending | B．was attending |
| C．will be attending | D．will have attended |