Last term our maths teacher set so difficult an examination problem _____ none of us worked out.
#73260
A
that
B
as
C
so that
D
which
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Stephen Hawking believes that the earth is unlikely to be the only planet _life has developed gradually.
#68503
A
that
B
where
C
which
D
whose
---It’s said that Williams will come to help us.--- we depend on him, we have to do most of the work ourselves.
#67780
A
No matter what
B
However much
C
Whatever
D
However
It hit me _________ my mother could be the proper person to persuade Dad to change his mind．
#69287
A
which
B
what
C
that
D
if