—It is _______he often fails in exams_______ makes his parents worried about him.—So, he has to work whole-heartedly.
#59068
A
what, that
B
that, what
C
that, that
D
/, that
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The waste can be recycled into new products, which _________ will save natural resources.
#4716
A
in turn
B
in return
C
in order
D
in time
--What about the protection? ---Let’s keep the surface ____ dirty by putting a cover over it.
#4689
A
far from
B
free from
C
apart from
D
away from
He didn’t make ______ clear when and where the meeting would be held.
#4856
A
this
B
that
C
it
D
these
In the botanic garden we can find a（n）______of plants that range from tall trees to small flowers.
#4939
A
species
B
group
C
amount
D
variety
Richard was called in by the police to answer questions _______ the disappearance of Thomas Ripley, whose relatives were so ______ his present situation.
#4655
A
concerning; concerned about
B
concerned; worrying about
C
with regards to; concerned
D
regarding; concerning about