Once harm ______ to the environment, it takes years to have the system recovered.
A.does | B.is done | C.will be done | D.be done |
—Why,I didn’t get you on the phone.
—We ________football on the playground when you phoned.
A.must be playing |
B.must play |
C.must have played |
D.must have been playing |
—I wonder where Peter is.He said he’d be here for lunch.
—Don’t worry!He________be caught in the rush hour.
A.will | B.should |
C.can | D.may |
My mother is a great cook and we ________ never get enough of her cookies.
A.may | B.need |
C.should | D.can |
—Could I have a word with you,mum?
—Oh,dear,if you ________.
A.can | B.must |
C.may | D.should |
It is important to know about the cultural differences that ________ cause problems.
A.must | B.dare |
C.may | D.shall |