It was dark when Mary went out. I wonder how she ______ through the black lane by herself.
| A．dared not to go | B．dare going | C．not dare go | D．dared to go |
If their marketing plans succeed，they ________ their sales by 20 percent.
| A．will increase | B．have been increasing |
| C．have increased | D．would be increasing |
The wet weather will continue tomorrow when a cold front ________ to arrive.
| A．is expected | B．is expecting |
| C．expects | D．will be expected |
We first met on a train in 2010，but we both felt immediately that we ________ each other for years.
| A．knew | B．have known |
| C．had known | D．know |
—I'm sure Andrew will win the first prize in the final.
—I think so.He ________ for it for months.
| A．is preparing | B．was preparing |
| C．had been preparing | D．has been preparing |
I like these English songs and they ________ many times on the radio.
| A．taught | B．have taught |
| C．are taught | D．have been taught |