19. The general ordered that the enemy ____ stopped.
A. is
B. be
C. was
D. to be
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20. I would have come sooner but I ____ that you were waiting.
A. didn't know
B. hadn't known
C. hasn't know
D. don't known
21. If you ____ see Mr. Allen, give him my regards.
A. should
B. would
C. shall
D. will
22. You are late. If you ____ a few minutes earlier, you ____ him.
A. come; would meet
B. had come; would have met
C. come; will meet
D. had come; would meet
23. He looked as if he ____ ill for a long time.
A. was
B. were
C. has been
D. had been