The mother asked the boy ________ football in the street. It was dangerous.
| A．to play | B．playing |
| C．not to play | D．not playing |
—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 |
“You ______ your teacher for help. He is kind-hearted.” “Yes. A whole day _______.”
| A．can ask, will waste |
| B．must have asked, had wasted |
| C．could have asked, was wasted |
| D．shouldn’t have asked, would be wasted |