6．Mr·Brown gradualy_________aknowledge of the subject．
A． required
B． inquired
C． achieved
D． acquired

7．If I am not _________ when you come to my office，ask for my secretary．
A． suitabe
B． available
C． comfortable
D． proper

8．peasants suppy workers with food， and workers________ supply peasants with manufactured goods．
A． in turn
B． by turn
C．for return
D．by return

9．Let’s go out during the break to_________ our legs。
A． stretch
B． expand
C． move
D． extend

10．I have just___________abeautiful poem in that little book.
A． come to
B． come through
C． come across
D． come up

6.D 7.B 8.A 9.A 10.C