Christmas ________ important festival in the USA.
A. is a B. is an C. are a D. are an
School students ___smoke because it is against the school rules.
| A．needn’t | B．couldn’t |
| C．won’t | D．mustn’t |
Some people ___feel sick when they read a book in a car or on a boat.
| A．must | B．should | C．may | D．need |
Cars, buses and bikes ___stop when the traffic lights change to red.
| A．may | B．must | C．can | D．need |
—Where___ you ___last night?
—I went to the supermarket and bought a present for my younger sister.
| A．did; go | B．do; go |
| C．did; went | D．do; went |
I ___ an article about first aid. It’s useful in emergency situation.
| A．read | B．saw | C．looked | D．watched |