The strange disease_________to have originated in Africa.
A.thinks
B.is thinking
C.is thought
D.thought

Concern for the environment is now at the_________of many governments' policies.
A.core
B.aim
C.target
D.purpose

People tend to work hard at this_________of life.
A.distance
B.stage
C.space
D.level

A.vein
B.reign
C.foreign
D.main

With black hair and eyes, she is_________of the people from her country.
A.the same
B.typical
C.similar
D.identical

Before bridges were built, all transport across major rivers in the United States were by ferry boat.
A.were built
B.across
C.were
D.by

A.parallel
B.label
C.vessel
D.chapel

A.control
B.patrol
C.idol
D.extol

A.remain
B.seaman
C.contain
D.retain

What time did the meeting end?”
“_________ ”
A.Just before lunch.
B.For half an hour.
C.Dissecure.
D.Unsecure.