We packed up the things we had accumulated(累积)over the lastthree years and left.

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We packed up the things we had accumulated（积累）over the last three years and left.

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单选题

I think the benefits of opening up space far the damage that we can see.

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Most of the electronic devices of this kind , ____ manufactured for this purposes , are tightly packed.

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We are using up our natural resources too quickly and at the same time we are__our environment with dangerous chemicals.

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单选题

The clay must be packed into the mold as ------- as possible to prevent air pockets from forming.

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