1．Some prepositions are omitted in American English.
在美式英语中，一些介词被省略了。
2．So far, the moon has been visited by man already.
到目前为止，月球已被人类到访过了。
3．A talk on Chinese history will be given in the school hall next week.
下周，一场关于中国历史的讲座将在学校礼堂举行。
4．A lot of things are being done by the doctors to save the little girl now.
现在医生们在用尽一切方法救治那个小女孩。
5．The monkey was seen to jump off the tree just now.
刚才那只猴子被看到从树上跳了下来。
6．How many trees had been planted by the end of last year?
到去年年底，已经种了多少棵树？
7．A nice picture was being drawn for our teacher at this time yesterday.
昨天这个时候，正在为我们老师画一幅漂亮的画。
8．Was the city built in 1880?
这座城市被建于1880年吗？
9．Will the food be sent to the homeless tomorrow?
明天这些食物会被送给无家可归者吗？
10．Has the girl been allowed to go out alone at night yet?
那个女孩已被允许晚上独自外出了吗？
