1.如果有昆虫袭击一棵树，那么它会立刻同志它的邻居。
If __any insects attack_____________a tree,it will ____inform its neighbor_____at once.
2.砍树或烧树木是错误的。
It is wrong to cut down or____burn_____trees.
二.1.The football games last year firmed_______ the friendship between the two teams.
2.Trees are natural_______ air-conditioners so we must plant more trees.
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