However much ______, it will be worth it.(1.0)
A. does the watch cost
B. costs the watch
C. the watch will cost
D. the watch costs
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I can’t find my dictionary. I wonder whether Mary ______ it.(1.0)
A. used
B. has
C. is using
D. had
The world’s supplies of copper ______.(1.0)
A. have been gradually being exhausted
B. have gradually exhausted
C. are gradually exhausted
D. are being gradually exhausted
This is the first time ______ such an accident.(1.0)
A. I see
B. I saw
C. I have ever seen
D. I had seen
The enemy ______ trouble.(1.0)
A. constantly make
B. were constantly making
C. were making constantly
D. were being made
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