填入适当的介词或副词。

1．There is an old bridge________ the river.

2.  I like the skirt _______ some flowers on it.

3.  Can you finish the work ________his help?

4.  The boy is looking _________ the sea ___________the window.

5.  It’s quite cold. The temperature is _____0ºC.

6.  You can’t see the hat. It’s _______ the door.

7.  Wash your hands ________ meals.

8.  Don’t stay _______.  Please come in.

9.  Be friendly _____-the animals.  They are our friends.