The parents are _____ their son who has been away from home for days.
A. in search of B. to search
C. searching D. searched for
The book, _______ is blue, is mine.
A. cover of which B. which cover
C. of which the cover D. all the above
_____ the watch and see if you can find out what’s wrong with it.
A. Pack up B. Break down C. Dig out D. Take apart
John is a good swimmer, but I don’t like the way ____ he always shows off in front of everyone.
A. how B. why C. 不填 D. which
_____ you understand the rules of the game, you will enjoy it.
A. Before B. Even if C. Once D. While
The child asked his mother ______ go out to play tennis.
A．that he could B．if he could C．if could he D．that could he
