单项选择题When she retired she did a lot of()work for the Red Cross.

A.valid
B.portable
C.prosperous
D.voluntary


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1.单项选择题What these young men were doing()a threat to the safety of the whole neighborhood.

A.constructed
B.contracted
C.constituted
D.contributed

2.单项选择题Doctors hope to()a human heart into the patient within the next few days.

A.transfer
B.transform
C.transplant
D.transport

3.单项选择题The tension()as the guest of honor was about to announce the winner.

A.mounted
B.accented
C.climbed
D.raised

5.单项选择题Harry()his pants at the seams (接缝) when he bent over.

A.sliced
B.split
C.cracked
D.broke

7.单项选择题He went ahead()all warnings about the danger of his mission.

A.in case of
B.in place of
C.in spite of
D.regardless of

8.单项选择题I have made()mistakes in my writing so that I can ask my students to find and correct them.

A.false
B.intensive
C.deliberate
D.accidental

10.单项选择题Airport security was extra tight()yesterday's bomb attacks.

A.in the wake of
B.since
C.inspite of
D.during