It was at 3 o'clock ____ they received the phone.
A. what
B. that
C. which
D. when
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It was two years ago ____ his sister became a doctor.
A. when
B. who
C. that
D. what
It was my mother ____ bought me a computer last week.
A. which
B. what
C. who
D. whose
It was because of his good performance at the interview ____ he got the job with the big company.
A. why
B. what
C. that
D. while
It was two months ago ____ a young scientist solved this problem.
A. when
B. which
C. what
D. that
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