The countryside gives us peace and quiet, which is ______ we can’t enjoy living in the city.
A.
that B. what 
why
D. where
This problem is said _____ three times at the meeting. However, they haven’t arrived at a conclusion now.
A. to have discussed B. to have been discussed
having been
discussed D. having discussed
______ his knowledge of the mountainous country, John Smith was appointed as our guide.
A. In spite
of B. On account of 
Regardless
of D. Instead of
Production fell _____ 20% in May, _____ the same month of last year.
A. in; compared to B. by; compared to
with; compared
with D. by; comparing with
Had you listened to the doctor, you _____ all right now.
A.
are B. were 
would
be D. would have been
The problem was raised _____ we should get all the machines _____.
A. that; to repair B. which; repaired
where; to be
repaired D. when; repaired
