The homework was assigned by the teacher.   這些家庭作業(yè)是老師布置的。

　　They crossed the river by ferry.   他們乘渡船過了河。

　　She took my umbrella by mistake.   她誤拿了我的傘。

　　This is one of the most commonly used methods.這是最常采用的方法之一。

　　I never know what to expect from one day to the next.一天又一天我不知道該期待什么。