-I ________ there are some books in the bag.

-No, I think there's a ball in it.

-Are these your rulers?

-________.

---“I can't find my bike. Do you know?”   

---“_________.”

--We never know ________ he is.

--They say he is a doctor.

--Who washed the plates on the table?

--Jenny ________.

--Do you often visit your parents?

--Yes, very often.

--Thanks a lot for helping me.

--________.

--What's the date today?

--________.

--I have got a bad cold. I feel terrible.

--________.

I'm going to Dalian to spend the holiday tomorrow.

__________.