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一、学习下面的生词,选择合适的词并用其恰当形式完成句子 look out 小心,当心　optimistic adj.乐观的,乐观主义的 dishwasher n.洗碗碟机 1.Rather than spend hours at the kitchen sink,I’d prefer to buy a　　　　　.  2.The President said he was　　　　　that an agreement could be worked out soon.  3.When crossing the street,　　　　　for cars.  答案:1.dishwasher　2.optimistic　3.look out