7.____________of the truth of the reports, he told his colleagues about it.
| A．Convincing | B．Convinced | C．To convince | D．Having convinced |
I hope you should achieve a ______ between your school work and your hobbies.
| A．difference | B．balance |
| C．connection | D．weight |
The coal miners ______ in the coal mine for 10 hours before we came to their rescue.
| A．had trapped | B．had been trapping |
| C．had been trapped | D．would have been trapped |
______ ，customers spend about 1.5 million pounds a day.
| A．In average | B．On average |
| C．In common | D．On the contrary |
His father came out of prison ______ Dickens have a chance to go to school.
| A．Not before; had | B．Only before; would have |
| C．It was until; had | D．Not until; did |
School children must be taught how to deal with dangerous ______ .
| A．states | B．conditions |
| C．situations | D．positions |