______you will never convince him.
A. However long you argue
B. However you argue long
C. How you argue long
D. How long you argue
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______new products have been successfully trial-produced.
A great deal
B. A large amount of
C. A plenty of
D. A large number of
The rain was heavy and______the house was damaged.
A. consequently .
B. constantly
C. consistently
D. continuously
He has made a discovery, ______of great importance to the progress of science and technology.
A. I think which is
B. which I think is
C. that I think is
D. of which I think it is
Without his wise mother, he______such a successful scientist.
A. would not become
B. should not have become
C. may not have become
D. could not have become
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