The fact has worried many scientiststhe earth is becoming warmer and warmer these years.
| A． | what | B． | which | C． | that | D． | though |
It’s nearly seven o’clock. Jack _____ be here at any moment.
| A．must | B．need | C．should | D．can |
They must have finished the work, ______?
| A．mustn’t they | B．haven’t they | C．hadn’t they | D．didn’t they |
－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 |
－The door was open.
－It ______ open. I had locked it myself and the key was in my pocket.
| A．can not be | B．must not be | C．can not have been | D．must not have been |
.－Mum, I climbed to get the Teddy Bear from the top of the shelf.
－My goodness! You ______ yourself. You ______ do that next time.
| A．must have hurt; mustn’t | B．should have hurt; can’t |
| C．may have hurt; mustn’t | D．might have hurt; won’t be able to |