People are living in ___ world where mouse clicks rule our life, so online searches have become _____ must.
| A．the; / | B．/; a | C．a; a | D．a; the |
“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 |
Why did you just sit and watch? You _______ me.
| A．could help | B．should help |
| C．could have helped | D．must have helped |
“Why didn’t she come to the meeting yesterday?” “I’m not so sure. She ______ ill.”
| A．should be | B．should have been |
| C．must be | D．might have been |
He ______ the test again, in which case, his mother will be very disappointed.
| A．might fail | B．must have failed |
| C．should fail | D．could have failed |
I didn’t see her in the meeting room this morning. She ______ have spoken at the meeting.
| A．mustn’t | B．shouldn’t |
| C．needn’t | D．couldn’t |