The cleaners make a great contribution to _____ the city clean.

A.kept B.keeping C.keep D.be kept

—What about playing football this afternoon, Sam?

—I would rather at home than football. It’s too hot outside.

A.stay; playing B.stay; play

C.to stay ; to play D.to stay; playing

----Which of the two pairs of shoes will you take ?

----I’ll take _____ .They are too small for me.

A.both B.all C.either D.neither

---May I have a look at your plan for the robot ?

----Sorry ,I’ve _____ it at home .

A.missed B.forgotten C.left D.lost

It’s said that _____ of the water around the world _____ polluted.

A.two third ;has B.two thirds ;have

C.two third ; are D.two thirds ;is

I remember ______ the math problem ______.But I can’t remember it’s answer.

A.working ;out B.to work ;out

C.working ;with D.to deal ;with

---Who helped you clean the classroom yesterday?

---_______. I did it all by myself.

A.Someone B.Anyone C.Nobody D.Everybody

---How many Chinese astronauts ______ into space since 2003?

----Twelve , including two women.

A.were sent B.sent C.have been sent D.have sent

---Why don't you go hiking today?

----I prefer ______ at home to ______out because the weather is too bad.

A.staying ; going B.stay ; go

C.to stay ;go D.stay;going

---It _____ ten years since we _____ last time.

---Yes. How time flies!

A.was ;meet B.was ;met

C.has been; met D.is ;meet