--How much         the pants?

-- __ twenty dollars.

--Are you feeling all right today?

--Not very well.

--________.

--You teach me English and I teach you Chinese.

--________.

--I’m sorry for what I said.

--________.

--I’m leaving.

--What? Some kind of joke?

--No. ________.

--Do you mind if I sit here?

--No, but ________. It’s for the old man.

“I have finished my homework.”

“Really? When ________ you ________ it?”

“Do you know when ________ again?”

“I'll let you know when ________.”

-How do they get to school?

-They usually get to school ________．