She never lets her daughter participate in an activity unless it is under the supervision of an adult.
A.The only activities in which she allows her daughter to take part in are those watched over by a grown-up.
B.As long as she herself is present at the activity, she permits her daughter to join in.
C.If an older person is in attendance, she usually agrees to her daughter's participation in activities.
D.She always takes her daughter to activities which are supervised by grownups.

We couldn't have managed our business successfully without my father's money.
A.If we could manage our business successfully, my father would give us his money.
B.Hadn't it been for my father's money, we couldn't have managed our business successfully.
C.We could have managed our business successfully with my father's money,
D.If we couldn't have managed our business successfully, we would have had my father's money.

No sooner had he been appointed to the post than the new director fell ill.
A.Immediately after his appointment to the post, the new director fell ill.
B.After the new director fell ill, he had been appointed to the new post.
C.Because he had been appointed to the post, the new director fell ill.
D.The new director had no sooner been appointed to the post when he fell ill.

_______(73)
A.upon
B.in
C.at
D.for

_____(75)
A.use
B.make
C.lose
D.spend

_______(77)
A.you
B.your
C.yours
D.yourself

_____(78)
A.interests
B.fields
C.opinions
D.attendances

______(80)
A.a
B.an
C.the
D.this

A.contact
B.talk
C.keep touch
D.stay in touch

Undersea vehicles __________.
A.make direct observations of the ocean floor
B.have the same limitations that divers have
C.are very slow to respond
D.are too small for a man to fit inside