ll.He learned how to operate the computer before he came to work here,__________ he?
A.didn't
B.wouldn't
C.shouldn't
D.hadn't
12.Hearing his alarm clock ringing,he turned it off and slept for __________ twenty minutes.
A.another
B.other
C.still
D.further
13.--Excuse me,would you mind __________ in this room?
--No,not at all.
A.not to smoke
B.not smoke
C.not smoking
D.to not smoke
14.--Many things __________ impossible in the past have come true now.
A.to be considered
B.considered
C.being considered
D.were considered
15.--Can you speak German?
--I can speak a little __________ I can't understand much.
A.and
B.but
C.otherwise
D.or
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