單項選擇題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.單項選擇題What these young men were doing()a threat to the safety of the whole neighborhood.

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

2.單項選擇題Doctors hope to()a human heart into the patient within the next few days.

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

3.單項選擇題The tension()as the guest of honor was about to announce the winner.

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

5.單項選擇題Harry()his pants at the seams (接縫) when he bent over.

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