If protect, a solar cell lasts for a long time and is a good source of energy.
A.protect
B.solar
C.lasts
D.source of

The oxygen content of Mars is not sufficient enough to support life as we know it.
A.sufficient enough
B.to support
C.as
D.it

The Alaskan malamute, used extensively for pulling sleds, is closely related about the wolf.
A.used
B.for pulling
C.closely
D.about

___________(28)
A.burglary
B.one
C.item
D.invariably

The immigration laws have been continually changed over the past few years for no logical reasons.
A.It is not fair that the laws have been changed so much over the past few years because of the flow of immigrants.
B.There’s no reasonable explanation as to why the immigration laws have been altered repeatedly in the last few years.
C.The reason why they changed the immigration laws recently has not been explained very convincingly.
D.The fact that the immigration laws have been continually changed over the recent years must have a reason.

It was obvious that the old house was past its prime.
A.Obviously, the old house used to be more unattractive.
B.The old house had obviously known worse days.
C.The old house had obvious seen better days.
D.Obviously, the house is much better now.

You should have studied electrical engineering, as it would have made it much easier for you to find a job.
A.It is very easy for qualified engineers to find jobs, so keep this in mind when choosing your career.
B.If I were you, I would study electrical engineering, since there are plenty of jobs for people in that profession.
C.If you chose to study electrical engineering, you wouldn’t have much trouble finding a job.
D.Had you studied electrical engineering, you would not have had nearly so much trouble finding a job.

In 1952, Akihito was officially proclaimed heir to the Japanese throne.
A.installed
B.declared
C.denounced
D.advised

The augmentation in the population has created a fuel shortage.
A.increase
B.necessity
C.demand
D.decrease

A.smoothly
B.southern
C.breath
D.airworthy