. –Excuse me, sir ______ –I’d like a beer and beef steak.

Are you interested in learning math?—Yes, but I’m afraid to _______ too much time on math.

is your trip to Beijing. — It’s about 2 days. [ ]

They saw a wonderful film about life _____ the future.[ ]

I always tell my students _________ on the road because it’s really dangerous. [ ]