说出为什么括号里填这个.1.people should always (be friendly) to each other2.we (have)already (visited)whe botanical.3.we should (reuse) the plastic bags.

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说出为什么括号里填这个.
1.people should always (be friendly) to each other
2.we (have)already (visited)whe botanical.
3.we should (reuse) the plastic bags.

friendly为形容词,要与be动词连用,should为情态动词,后面动词用原形.
由already看出此句话为现在完成时,have+过去分词.
这句话是根据句子本身意思,要再次使用塑料袋,不要用一次就直接扔掉.