15.If you are a member of a club, you must __ to the rules of that club.
A.conform
B.appeal
C.refer
D.access
16.I tried to relax because I knew I would use up my oxygen sooner, __
A.the more excited I got
B.I got excited more
C.and more I got excited
D.and I got more excited
17.The toy maker produces a __ copy of the space station, exact in every detail.
A.minimal
B.minimum
C.miniature
D.minor
18.I should like to rent a house, modem, comfortable and __ in a quiet neighborhood.
A.all in all
B.above all
C.after all
D.over all
19.Some parents are only concerned __ their children's grades in studies.
A.of
B.at
C.about
D.for
20.This disease __ itself in yellowness of the skin and eyes.
A.manifests
B.modifies
C.magnifies
D.exposes
21.Dr.Wang has made much contribution to the theories of modem physics at the __ of his health.
A.cost
B.disposal
C.mercy
D.expenditure
22.If I take this medicine three times a day, it should __ my cold.
A.heal
B.cure
C.treat
D.recover