In order to make our city green, _______.
| A．it is necessary to have planted more trees | B．many more trees need to plant |
| C．our city needs more trees | D．we must plant more trees |
After the new machine was introduced, the factory produced _____ in 2011 as the year before.
| A．twice as many machines |
| B．twice many as machines |
| C．as twice many machines |
| D．as many machines twice |
There ____ a temple on the side of the mountain, didn't there?
| A．would be | B．would have | C．used to have | D．used to be |
Can't we just live today, ____ the worries of tomorrow or the regrets of the rest?
| A．tired from | B．aware of | C．sure of | D．free from |
Try to put the candidate ____ by being friendly and informal.
| A．with confidence |
| B．by heart |
| C．in peace |
| D．at ease |
—Why can your neighbor know so much about London?
—He ____ have been there before.
| A．must | B．can | C．should | D．need |