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However,at times this balance in nature is _____,causing a number of possibly unforeseen effects.
A.
troubled
B.
puzzld
C.
disturbed
D.
destroyed
It's very dangerous to use those machines that _______.
A.
are repaired
B.
are being repaired
C.
is being repaired
D.
is repaired
The pupils _______ doing their exercises in the classroom now by their teacher.
A.
have kept busy
B.
are busy
C.
are keeping busy
D.
are being kept busy
He said yes _________ he was asked if he could possibly serve as a teacher in the remote area for two years.
A.
for a moment
B.
the moment when
C.
in a moment
D.
the moment
We had to close the door to ________ the cold out of the house.
A.
prevent
B.
keep
C.
put
D.
break
Li Ming is ________ to ask for help from them.
A.
possible
B.
probable
C.
likely
D.
maybe
China has ________ a number of satellites into the sky.
A.
carried up
B.
sent up
C.
put up
D.
kept up
I intend ________ swimming this afternoon.
A.
to go
B.
going
C.
went
D.
to have gone
________ you get there, you must call me right away.
A.
If
B.
Once
C.
Because
D.
For
Since you have ________ a promise, you should never break it.
A.
kept
B.
made
C.
gave
D.
carry out
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