I have two grammars, ______are of great use.
#73806
A
all of which
B
either of which
C
both of that
D
both of which
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The thought of going back home was ___kept him happy while he was working abroad．
#74489
A
that
B
all that
C
all what
D
Which
_____________ leaves the room last ought to turn off the lights.
#74044
A
Anyone
B
The person
C
Whoever
D
Who
in the regulations that you should not tell other people the password of your e-mail account.
#72904
A
It requires
B
It is required
C
What requires
D
What is required