She was very excited about new colleagues and changes ____ she noticed in her department.
A. that
B. who
C. which
D. whom
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There are occasions ____ which we might well make wrong decisions.
A. for
B. at
C. in
D. on
Our total sales amount to $2 million, ____ represents a 15% increase.
A. for which
B. as
C. that
D. which
Self-driving is an area ____ China and the rest of the world are on the same starting line.
A. that
B. where
C. which
D. when
This might be the possible reason ____ he didn't attend the meeting.
A. why
B. which
C. for
D. that