题目内容

They hope to _________________ the source of the infection.

A. maketracks
B. takedown
C. track down
D. keep track

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He made a generous ___________________ of 50,000 dollars in cash to the library.

A. donate
B. donation
C. contribute
D. collection

The ____________ of the traffic gave me a headache.

A. clamor
B. claim
C. creak
D. screech

Please ______________ from smoking during the performance.

A. reflect
B. refrain
C. resume
D. recover

The place was ____________ with dashing young men.

A. heaving
B. heaved
C. heavy
D. heady