By serving others，a person focuses on someone other than himself or herself，______ can be very eyeopening and rewarding.
#72267
A
who
B
which
C
what
D
that
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Since it is expected that Fed will cut interest rate again, there is no doubt ___the company will make the decision on raising the price of crude oil.
#72913
A
why
B
that
C
whether
D
when
The other day, only an old couple came to see my art exhibitions, ______thought highly of them.
#73643
A
none of whom
B
neither of whom
C
neither of them
D
both of them
My parents have promised to come to see me before I ______ for Africa.
#68242
A
have left
B
leave
C
left
D
will leave