1. My uncle became lame in an accident and it is impossible for him to walk _____falling over
from time to time.
A. without B. until C. except D. by
2. Hearing the news, he can’t help but _______ out of the room.
A. to be rushed B. to rush C. rushing D. rush
3. — Why does Michael know so much about Angkor Watt?
— He ______ have been there, or he just heard by chance.
A. must B. oughtn’t to C. may D. can’t
