---May I speak to Mr. Smith? ---Sorry, he           . Can I take a message? 
#53437
A
sleeps
B
is sleeping
C
sleep
D
sleeping
推荐题目
 I used to be afraid to speak in front of public before, but recently I _____ a lot.
#52312
A
have improved
B
improved
C
will improve
D
am improving
You must be very tired. Why not         a rest?
#59979
A
stop taking
B
stop to take
C
to stop taking
D
to stop to take
Li Lei often takes care of the old woman after school.
#58947
A
looks like
B
looks for
C
looks up
D
looks after