欣赏右边漫画《选择》，要走好环保、节约之路，我们必须①有严格的制度保障②从自身做起、从小事做起③建设资源节约型、环境友好型社会④把环保、节约作为当前工作中心
________ the arrival of the police, I would have been robbed by two masked men.
I know that it will be difficult to pick him out in such a crowd, but if you ________ happen to see him, give him this packet.
She didn't come to the party last Sunday. ________， she must have made the party more exciting.
Students ________ remain in their seats until all the papers have been collected.
—Did Ann fail in English? —She ________. Don't you notice that she looks depressed?
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