When and why he came here ________yet.A. B.C.D.
A. is not known
B. are not known
C. has not known
D. have not been
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I wonder how much ________.
A. does the watch cost
B. did the watch cost
C. the watch cost
D. the watch costs
Maryis ________ someone might recognize her.
A. afraid of
B. afraid about
C. afraid that
D. afraid for
They came to the conclusion________ by a computer.
A. that not all things can be done
B. because of not all things be done
C. being not all things can be done
D. because not all things can be done
Why the explosion occurred was________ the laboratory attendant hadbeen careless.
A. for
B. because
C. since
D. that
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