Some of this heat near the earth's surface _________ make electricity.
| A．is used for | B．is used to | C．gets used to | D．used to |
He ____ the cave before the police arrived, but he failed.
| A．managed to flee away from | B．tried fleeing out of | C．managed fleeing | D．tired to flee |
It was proved that the problem __ partly in the air pollution.
| A．lies | B．lied | C．lay | D．laid |
The cruel war __ his wife and children.
| A．robbed | B．robbed of | C．robbed him | D．robbed him of |
The boy seized a stick and ___ the dog, but it ran away.
| A．beat | B．struck at | C．hit | D．knock at |
I’m looking forward __ you again.
| A．to see | B．to seeing | C．seeing | D．to be seen |