Staying in hospital and taking special medicines ________ drug users an opportunity to stay away from drugs, which is________ the key to breaking the addiction to drugs lies.
#101126
A
serves; where
B
provides; what
C
give; that
D
allow; where
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New technology ______ to make sure that the cars, taxis, buses and trains we use ______ the air.
#104707
A
is used; not to pollute
B
has used; is not polluted
C
is being used; do not pollute
D
has been used; to pollute
My last job lacked variety; I __________ the same things all the time.
#100357
A
did
B
have done
C
was doing
D
have been doing