It was two years ago ____ his sister became a doctor.
A. when
B. who
C. that
D. what
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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
It is she ____ is right.
A. who
B. which
C. what
D. how
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