We cannot make a___calculation of the price until we have all the costs
| A．precise |
| B．concise |
| C．correct |
| D．right |
I was about to leave my house _____the phone rang.
| A．while | B．when | C．as | D．after |
_____ we were singing, the teacher came in.
| A．Before | B．after | C．As | D．Until |
You like sports_____I’d like to read.
| A．when | B．while | C．but | D．yet |
The hard he works, _____he will make.
| A．the greater | B．the greater progress |
| C．and the more | D．more |
Work hard _____ you can succeed.
| A．in order to | B．so that | C．for fear that | D．in case |