Paper making began in China and from there it_____ to North Africa and Europe.
A. sprang
B. spilled
C. carried
D. spread
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-Is Bob still performing?-I’m afraid not. He is said ______ the stage already as he has become an official.
A. to have left
B. to leave
C. to have been left
D. to be left
Police are now searching for a woman who is reported to ______ since the flood hit the area last Friday.
A. have been missing
B. have got lost
C. be missing
D. get lost
AIDS is said ______ the biggest health challenge to both men and women in that area over the past few years.
A. that it is
B. to be
C. that is has been
D. to have been
It is ______ the possible dangers in the ocean that dolphins seldom sleep according to some scientist’s research findings.
A. that it is
B. to because
C. because
D. because of