用单词的适当形式填空。
have   sit be    look    open
（1）There ________three small eggs and a big egg.   
（2）Mother Duck________on the eggs.   
（3）The big egg________later.   
（4）It is winter. It is cold. The ugly duckling________no home.   
（5）The ugly duckling________into the water. He is a beautiful swan.

The leaves on the trees ____ yellow and brown. ( )

A．is

B．are

C．was

—________my master? (   )
—No, he isn’t.

A．Are you

B．Is he

C．Is she

D．Is you

This _____my bedroom. （    ）

A．are

B．is

C．am

Look, the bird _____ flying. (    )

A．is

B．are

C．was