—We are worried about Tom. Why hasn’t he come back?
—Don’t worry. He ______ in a traffic jam.
| A．might be caught | B．may have been caught |
| C．can have been caught | D．should have been caught |
_____for his expert advice, he was able to help a great number of people with their personal affairs.
| A．Being known | B．Having known | C．Well known | D．Knowing |
As soon as the manager enterd his office, he began to ______the telephone.
A.look up B. look upon C. look through D look for
The little girl couldn’t work the problem out. She wasn’t _____clever.
| A．that | B．much | C．many | D．too |
A computer cannot remember who_____; it simply does what _________.
| A．will use it; it is told | B．uses it; it has told |
| C．used it; it is told | D．has used it; it told |
The famous scientist was going out _____ he found himself surrounded by lots of young people.
| A．when | B．before | C．while | D．after |