--It’s said that no one ______ light a cigarette at a gas station.
--- Yes. Safety always comes the first.
| A．can | B．may | C．shall | D．must |
—Why didn’t you put your cellphone in your overcoat pocket?
—I ________, but I was afraid it would be stolen.
| A．had put | B．put | C．would have | D．could have |
—Is there a fog in the evening ?
—There________be . I’ll make a phone call to find it out .
| A．must | B．would | C．will | D．might |
“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
| A．must; could | B．may; might |
| C．need; must | D．could; need |
“Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”
| A．might fall out | B．could fall out |
| C．should have fallen out | D．must have fallen out |
“Is there a flight to London this evening？” “There _______ be. I’ll phone the airport and find it out.”
| A．must | B．might | C．would | D．can |