题目内容

The materials____(use, used) have all been tested to make sure that they are safe.

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I felt____(embarrassing, embarrassed), not knowing how to answer his question, but Jane saved me by changing the subject.

If it were not for the____(involved expense, expense involved), I would go there by air.

____(Concerned parents, Parents concerned) have complained about the dangerous playground.

You can buy a two-year old ____(used Ford Mustang, Ford Mustang used), still in good condition, for half the price of a new one.

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