____ electricity plays such an important part in our life?
A. Why is it that
B. Why is it
C. Why it is that
D. Why is that
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It was in the lab ___ was taken charge of by Professor Harris ___ they did the experiment.
A. which; that
B. that; what
C. whom; that
D. which; where
Many people now make______ a rule to buy cards for their friends before Christmas.
A. themselves
B. it
C. that
D. this
Someone is at the door, who is _______?
A. this
B. that
C. it
D. he
-It is raining cats and dogs.- .
A. So it is
B. So is it
C. Neither it is
D. Neither is it
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