The school rule states that no child shall be，unless________by an adult，allowed out of the school during the day.
| A．was accompanied | B．accompanying |
| C．accompanied | D．being accompanied |
Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
| A．why | B．that |
| C．when | D．ours |
Work gets done __________ when people do it together, and the rewards are higher too.
| A．easily | B．very easy |
| C．more easily | D．easier |
Of the two coats, I’d choose the __________ one to spare some money for a book.
| A．cheapest | B．cheaper |
| C．more expensive | D．most expensive |
Speaking of all the songs he has written, I think this is probably his __________ one.
| A．better-known | B．well-known |
| C．best-known | D．most-known |
After two years’ research, we now have a __________ better understanding of the disease.
| A．very | B．far |
| C．fairly | D．quite |