____ it rain tomorrow, we would have to put off the visit to the farm.
A. were
B. should
C. would
D. will
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If I _____ in the 22nd century, I ________ my vacation in a very different way.
A. should live; would spend
B. will live; should spend
C. are living; should have spent
D. will be living; would have spent
I saw her in the office this morning. She ______ back to work without the doctor’s permission.
A. couldn’t come
B. couldn’t have come
C. should have come
D. should not have come
Jane's pale face suggested that she ___ ill .
A. be
B. was
C. should be
D. is
If the United States had built more homes for poor people in 1955,the housing problems now in some parts of this country ________ so serious.
A. wouldn't be
B. will not have been
C. wouldn't have been
D. would have not been