天哪,楼下的还是知道专家呢.试一下我的:
它是怎么被发明的?__How__ __Was__it invented?
微波炉是做什么用的?what _is__the microwave _being__ __used__ for?
他不记得把票放在哪了,看上去很着急.he couldn't remember where __he_ __put__ __his__ __ticket__ and he looked really worried.
作业做得很好,老师很高兴.the homework _was__ _done__ well_ and our teacher was very happy.