________ research has been done into this difficult and complicated case, so we believe someday we can solve it.
选项:
A:
Extensive
B:
Extinctive
C:
Executive
D:
Execrated
Extensive
Extinctive
Executive
Execrated
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extensive
B:extinctive
C:executive
D:execrated
Extensive
B:Exstinctive
C:Executive
D:Execrated
It has been doubled.
B:It has been tripled.
C:It has reached 830.
D:It has reached 200.
-- We can try to reduce rubbish, reuse water and recycle things
选项: A:why can we go green
B:how can we go green
C:why we can go green
D:how we can go green
cry
B:crying
C:cried
D:to cry
access
B:accomplish
C:admit
D:assess
How can we
B:How we can
C:Why should we
D:Why we should
assigned
B:assured
C:automated
D:attributed
Travel is exciting because we can have new experiences in exotic places.
B:Travel is instructive because we can gain a great deal of knowledge.
C:Travel is difficult because we have to deal with many problems.
D:Travel is discouraging because we have to visit a lot of unfamiliar places.
believe in
B:go through
C:be lost in
D:if it hadn’t been for
Whether we had liked it or not
B:Whether or not had we liked it
C:Whether we like it or not
D:If or not we had liked
in older to。
B:So that
C:Though
D:Now that
to
B:in
C:with
D:on