Study hard, _______ you will fail in the exam.
| A．or | B．and | C．but | D．because |
—What do you usually do in the morning?
－ I often practice__________ English.
| A．speak | B．to speak | C．speaking | D．spoke |
Eric is so careful that he always looks over his exercises to ________ there are no mistakes.
| A．make sure | B．find out | C．think of | D．look for |
Excuse me ,sir. You ______ open the door before the train stops.
| A．mustn’t | B．needn’t | C．may not | D．don’t have to |
The movie wasn’t ______.He fell asleep half way through it.
| A．interesting enough | B．enough interesting |
| C．interested enough | D．enough interested |
－Dad , why must I stop ______ computer games?
－ For your health, my boy.
| A．play | B．to play | C．to playing | D．playing |