6. Some women ________ a good salary in a job instead of staying home, but they decided not to work for the sake of the family.
A. must make
B. should have made
C. would make
D. could have made
7. A light with no more power than ________ by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam.
A. as is produced
B. that produced
C. that is produced
D. produced
8. For most people the sea was remote, and with the exception of early intercontinental travelers or others who earned a living from the sea, there was little reason to ask many questions about it, let alone________ what lay beneath the surface.
A. asking
B. ask
C. to ask
D. be asked
9.Even if they are on sale, these ________refrigerators are equal in price to, if not more expensive than, at the other store.
A. anyone
B. the others
C. that
D. the ones
10. The atmosphere is as much a part of the earth as ________ its soil and the water of its lakes, rivers and oceans.
A. are
B. is
C. do
D. has
