The police still haven’t found the lost child, but they’re doing all they             .
#63627
A
can
B
may
C
must
D
should
推荐题目
Tom has grown      enough to take care of      .
#77958
A
tall; him
B
tall; himself
C
old; him
D
old; himself
---Can you play the guitar?---________.
#74839
A
No,I can
B
Yes,I can’t
C
I can play the guitar
D
No,I can’t
There’s still an hour left, you _____ go in a hurry. 
#74519
A
must
B
needn’t
C
can
D
mustn’t