______(31)
A.for
B.on
C.of
D.with

________(33)
A.will
B.would
C.should
D.may

______(35)
A.day
B.time
C.while
D.ages

Which of the following is NOT the reason that makes water undrinkable?

A.acid rain
B.garbage
C.industrial pollution
D.high cost

How many countries throw industrial wastes into the Mediterranean Sea regularly?
A.exactly 16
B.exactly 15
C.nearly 16
D.less than 15

“Please don’t leave until I come back,” Sarah said.
A.Sarah told us do not leave until she comes back.
B.Sarah asked us do not leave until she came back.
C.Sarah told us not to leave until she came back.
D.Sarah said to us not to leave until she comes back.

Nam drives more carelessly than his sister does
A.Nam doesn’t drive as carefully as his sister does
B.Nam drives more carefully than his sister does
C.Nam’s sister drives more careful than he does
D.Nam’s sister drives as carelessly as he does.

People say that some Americans are superficially friendly.
A.Some Americans are said as being superficially friendly
B.Some Americans are said that they are superficially friendly
C.People are said that some Americans are superficially friendly
D.Some Americans are said to be superficially friendly

My brother and me are planning a party for our parents.
A.my brother and me
B.are
C.a party
D.for

It is becoming extremely difficult to grow enough to feed the world’s rapidly increased population
A.is
B.extremely difficult
C.to feed
D.increased population