—Who can help me? I can’t carry all the books. (    )
—Sorry, I am_____ the phone.

A．on

B．in

C．at

Look and write (T)  or (F)：- Where is the girl? -It's on the bed. （_______）

仿写句子
例：
What does he do?
He is a teacher.
How does he go to work?
He goes to work by car.

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We play football ____ the field.  ( )

A．to

B．on

C．at

________dinner, I watch TV.(  )

A．After

B．At

C．In