When I am tired with math exercises, I go out for a walk to get relaxed.
| A．should | B．must | C．need | D．will |
Everybody knows that we should not drink ___ water, or they will get burnt.
| A．boil | B．boiled | C．boiling | D．being boiled |
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 |