最佳答案:

　　1．It's easy to clean

　　2．between； and

　　3．eleven-year-old/11-year-old； crosses

　　4．come true

最佳答案:

　　1． or

　　2．For

　　3．difficult

　　4．river

　　5．cross

最佳答案:

　　1．[探究总结] （1）复数；不可数

　　[对点训练]

　　①D

　　②Many of

　　2．[对点训练] C

　　3．[对点训练] between; and

　　4．[对点训练]

　　①afraid of

　　②afraid that

　　③B

　　5．[对点训练]

　　①is like

　　②playing/to play

　　6．[对点训练] leave; for

最佳答案:

　　One possible version：

　　There are three people in my family． My father is a worker． It is 20 kilometers from our home to his office． It takes him 15 minutes to drive to his office My mother is a teacher She often takes the bus to work．It's 10 kilometers from our home to her school． It takes her 15 minutes． My school is near our home．It's only 1．5 kilometers． It's 20 minutes' walk．

最佳答案:

　　1． bridges

　　2． villagers

　　3． lives

　　4． to Write

　　5． to see