________ is really hard ________ them to climb such a high mountain．
| A．This；to |
| B．It；to |
| C．This；for |
| D．It；for |
I think the most helpful invention is light bulb. It seeing in the dark, and it gives people more time to work and play every day.
A. used to B. is used toC. is used for
We need to a plan to help disabled people. Do you have any ideas?
A. cheer up with B. come up with C. set up with
The students their pens when the teacher told them to stop writing.
A. turn down B. put down C. put off
–did the car cost you?
– I spent ￥15,000 for it.
A. How many B. How much C. How often
– Would you mind turning down the music?
– .
A. Yes, I would B. No, of course C. No, not at all