It is a waste to ________ good food.
A. throw away
B. throw in
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The customers wondered why these items were sold ________ such a low price.
A. at
B. on
Hobbies and interests can __________ our afterschool life.
A. enlarge
B. enrich
It is surprising that he left without __________ good-bye to us yesterday.
A. say
B. saying
Do you know Mr. Wang will __________ work in our college?
A. not longer
B. no longer
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