There _______ three books on the desk one hour ago. (    )

A．was

B．were

C．are

He usually ______ to school by bus, but he ______ to school yesterday. （ ）

A．goes, walked

B．go, walked

C．goes, walks

I _________ so naughty then. Now I _________ cute. (   )

A．is; was

B．was; is

C．was; am

句子改错
1. It was a hour late.
____________________________________
2. He usually got up at half past six.
____________________________________
3. He usually walk to school.
____________________________________
4. The earth go around the sun.
____________________________________
5. He doesn’t do his homework yesterday.
____________________________________

I______a letter to my friend last night. （   ）

A．write

B．wrote

C．writing