It is________ leather its permeability to air and water vapor.
A. the structure it gives
B. giving it the structure of
C. structure that gives it
D. its structures that gives
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__________ Einstein won the Nobel Prize for Physics.
A. It is in 1921 that
B. It was in 1921 that
C. It is in 1921 when
D. It were in 1921 that
It was because she was too inexperienced_________ she didn’t know how to deal with the situation.
A. so that
B. that
C. that is why
D. so
_________ that is most important.
A. It is what did he do
B. It is what he do
C. It is what he really has done
D. It is only he did
Never _________ give up the struggle for freedom and peace.
A. will they
B. they will
C. have they
D. they have
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