Never in the past twenty years so greatly as today.
| A．did the city change | B．the city changed |
| C．has the city changed | D．the city has changed |
The duties of a policeman are _____ than ____ .
| A．dangerouser ; a teacher | B．more dangerous ; a teacher |
| C．greater danger ; those of a teacher | D．more dangerous ; those of a teacher |
The black horse is _____ of the pair .
| A．the strongest | B．the stronger | C．the strong | D．quite strong |
Mother told Jim to watch the milk until it boiled and then _____ off the gas.
| A．turn | B．turning | C．turned | D．having turned |
They weren't a particularly good team, but they refused to give in and _____ defeat.
| A．accept | B．accepted | C．accepting | D．to have accepted |
He was in great need of money, so he _____ $5, 000 for his car.
| A．paid | B．took | C．cost | D．spent |