It is these poisonous products ____ can cause the symptoms of the flu, such as headache and achingmuscles.
A. who
B. that
C. how
D. what
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It was for this reason ____ her uncle moved out of New York and settled down in a small village.
A. which
B. why
C. that
D. because
It was ____ back home after the experiments.
A. not until midnight did he go
B. until midnight that he didn't go
C. not until midnight that he went
D. until midnight when he didn’tgo
Surroundings have changed and ____ in them.
A. so have the people
B. the people have so
C. have the people so
D. the people so have
____ you were coming today, I’d have met you at the airport.
A. Have I known
B. I have known
C. Had I known
D. I had known
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