Given the chance to show his ability, he regained and began to succeed in school.
A. success
B. confidence
C. opportunity
D. chance
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It is so difficult to the bottom of the ocean because some parts are very deep.
A. explore
B. know
C. develop
D. observe
There is widespread concern that the rising unemployment may a threat to social stability.
A. have
B. lead
C. pose
D. cause
After a (an) physical exam, my doctor said I was in good condition except that my blood pressure was a little high.
A. complicated
B. comprehensive
C. common
D. expensive
Some people believe that the earth can enough food to support at least twice its present population.
A. assemble
B. contribute
C. manufacture
D. yield