My mother ______ a nurse.（   ）

A．am

B．is

C．are

用所给单词的适当形式填空。
1. Yesterday we _________ (pick) many apples on the farm.
2. His teacher asked him to ______ (study) English hard.
3. He ________ (be) here just now.
4. They ______(leave) in a minute.
5. Mary’s father _____ (bring) a present on her next birthday.

There ________ so many birds on the tree.

A．am

B．is

C．are

Her hair _______long.（ ）

A．am

B．is

C．are

When ________ you born? (    )

A．were

B．are

C．is