—Shall I wait here for three hours?
—Yes. Three hours ______for you to wait for such a doctor.
| A．are not very long | B．is not long enough |
| C．was not long enough | D．will be too long |
William Tell hesitated to let his boy risk __ there with an apple on his head.
| A．standing | B．stood | C．to stand | D．to be standing |
Crusoe found that nine savages seemed to be eating something which they ___ on the fire.
| A．have cooked | B．had cooked | C．to have cooked | D．being cooked |
The half smile on the little hero’s face seemed to suggest that he was happy __ his life for his country.
| A．to give | B．giving | C．given | D．to have given |
He forgot to turn off the light.So he went to bed with the light ___on.\
| A．to turn | B．turned | C．turning | D．turn |
Asia is the largest continent, ___ one third of the earth’s land area.
| A．to cover | B．cover | C．covering | D．covered |