题目内容

To our delight, this new smoke alarm system can effectively _______ very weak signals.

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We have sent our union _______________ to look into the case and see who is responsible.

The project is an important step toward a national health service, and the authorities are trying hard to __________ the exercise facilities.

I ___________a letter of complaint to the manager of the store as soon as I found they had sold me a pair of mismatched shoes.

Their success was due_______________ their well-conceived (周密策划的) plan.