---How much difficulty did you have________________ this physics problem?
---_____________. It's quite easy.
| A．to solve, Nothing | B．solving; None |
| C．to solve, None | D．solving; Nothing |
---It _____ ten years since we _____ last time.
---Yes. How time flies!
| A．was ;meet | B．was ;met |
| C．has been; met | D．is ;meet |
---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 |
---How many Chinese astronauts ______ into space since 2003?
----Twelve , including two women.
| A．were sent | B．sent | C．have been sent | D．have sent |
---Who helped you clean the classroom yesterday?
---_______. I did it all by myself.
| A．Someone | B．Anyone | C．Nobody | D．Everybody |
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 |