16. Nobody but Jack and Jane ___________ made great progress in the class recently.
A. have
B. has
C. had
D. has been
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17. Either the teachers or the pesident _________ the meeting.
A. attends
B. attend
C. are attending
D. have attended
18. The number of articles published on smoking ________ amazing.
A. is
B. are
C. were
D. have been
19. In that country, the rich ________ richer, the poor, poorer.
A. become
B. has become
C. becomes
D. is becoming
20. Three-fourths of the buildings ________ during the war.
A. was destroyed
B. is destroyed
C. were destroyed
D. has been destroyed
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