选出不同类的单词：(   )

A．tall

B．short

C．but

用所给词的适当形式填空。
ring    cry    but   come   watch
1. My father is working on the computer, but my brother starts to ________.
2. My mother is cooking dinner, but the bell ________.
3. “Come in，please!” I say. My friend Lucy ________ in.
4. Mr Smart is reading a book and Mrs Smart ________ TV.
5. Lin Tao is doing his homework, ________ the phone rings.

I don’t want to eat, _______ I am very thirsty. ( )

A．so

B．and

C．or

D．but

Lucy is a naughty ________ nice girl. (   )

A．and

B．but

C．then

He’s swimming, _________it’s getting too cold. (   )

A．but

B．and

C．or