__________ you at school? (   )

A．Was

B．Is

C．Were

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.

How many students ______ there in your class?  (    )

A．is

B．are

Listen!The boys _______ singing.(   )

A．is

B．am

C．are

What ______ his job? （   ）

A．are

B．is

C．do