Although this ______ sound like a simple task, great care is needed．
| A．must | B．may | C．should | D．shall |
They had great difficulty ____ the people ____ in the fire.
| A．in rescue, trapping | B．to rescue, trapped |
| C．in rescuing, who trapping | D．rescuing, trapped |
It was midnight _____we reached the station.
| A．that | B．when | C．on which | D．which |
When he turned professional at the age of 11, Mike _____ to become a world champion by his coach and parents.
| A．expected | B．was expecting |
| C．was expected | D．would be expected |
In some countries where there is not enough coal, water is used to ____ electricity.
| A．making | B．make | C．be made | D．being made |
How I regretted ______ the hours in the forest ______ I should have studied hard in the classroom.
| A．to waste; when | B．to waste; where | C．wasting; when | D．wasting; where |