This company was the first ______ portable radios as well as cassette tape recorders in the world.
A. produce
B. to produce
C. have produced
D. produced
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The purpose of new technology is to make life easier, ______ it more difficult.
A. not making
B. not make
C. not to make
D. nor to make
The teacher asked us ______ so much noise.
A. not make
B. not making
C. don't make
D. not to make
Such books are not worth ______ at all.
A. of being read
B. to read
C. reading
D. being read
I regret ______ that last week.
A. to have done
B. having done
C. to do
D. to being doing
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