用所给动词的适当形式填空。

“What ________ you ________(do) at ten yesterday morning?”“I ________(feed) my dog.”

用所给词的适当形式填空

The walls are made from old glass which are ________ together. (glue)

用所给词的适当形式填空

If we keep on ________ trees, forests will disappear. (cut)

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I feel that there are few laws to stop people ________ the waste into rivers or into the sea. (put)

用所给词的适当形式填空

If fish are taken from the sea, there will soon be none ________. (leave)

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We should educate people ________ about the problems. (think)

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Our natural resources will last ________ if we learn to recycle them. (long)

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Many rivers and lakes have become ________ in our countries. (pollute)

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Manatees usually ________ about 1 000 pounds. (weight)

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This kind of animals are very ________. Don't get close to them. (aggressive)