1. 根据语境从方框中选择恰当的单词填空，有的需要变换形式，每词限用一次

glass, break, stairs, train, drop

1. （1） Throw that  cup away and then buy a new one.
3. （2） This red bottle is made of
5. （3） —Bob, youyour pencil.

   —Thanks. I' 11 pick it up.

7. （4） After hard Mike did very well in the basketball match.
9. （5） That child is going down the slowly.