_____ is known to all, the age _______ children can go to school is seven.
#70754
A
What; which
B
It; when
C
As; at which
D
Which; when
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We’ve just heard a warning on the radio _______ a typhoon may be on its way．
#68290
A
what
B
when
C
which
D
that
--- Could you do me a favour? --- It depends on ______ it is.
#73890
A
which
B
whichever
C
what
D
whatever
Unless __________, she won’t go to any party.
#68021
A
inviting
B
having invited
C
invited
D
being invited