15．---Tom is never late for work. Why is he absent today?
---Something ________ to him.
| A．must happen | B．should have happened |
| C．could have happened | D．must have happened |
I could just see a car in the distance, but I couldn't _____ what color it was.
| A．look out | B．make out | C．get across | D．take after |
The worker agreed to _____ the strike if the company would satisfy their demands.
| A．call for | B．call forth | C．call off | D．call up |
Li Ping is tall, ___, he is handsome.
| A．except | B．besides | C．but | D．and |
Years of hard work ___ his character.
| A．built | B．increased | C．raised | D．made |
The old man kept on studying Chairman Mao’s ___ in his ___.
| A．work . sixty | B．novels, sixtieth | C．works, sixties | D．books, sixty’s |