---Are you sure you have to do? It's been very late.

---I don't know ________ I can do it if not now.

---Where’s dad, Mike?

---He left a(an) ________ saying that he has something to do.

---Don’t you think his radio is too noisy?

---Yeah. I’ll go and ask him to ________.

---“Can you help me get the kite?”

---“________．”

---Keep quiet, kids. Dad _______ in the next room.

---OK, Mum.

--Who invented the light bulb?

--It was invented ________ Edison.

---________ are you going to be a computer programmer?

---I'm going to study computer science.

---My mother is ill. I have to look after her this afternoon.

---________.

---What do you think of Miss Li's teaching?

---Oh, no one teaches ________.