The air pollution is very serious in our city. Something about it now.( )
can do
must do
was done
must be done
All customers ________ to take their temperatures when they enter the supermarket.
A.is askedB.was askedC.are askedD.were asked
Not only Peter but also his father ________ crazy about the basketball match.
A.amB.isC.areD.be
—Bob,please ________ your spelling.You've dropped the "d" in the word "knowledge".
—Oh,yes.I'll be more careful next time.
A.listen toB.look forward to
C.pay attention toD.get used to
My classmate is running so fast!I ________ believe my eyes.
A.can'tB.needn'tC.mustn'tD.shouldn't
There ________ a concert in our school hall next week.
A.isB.wasC.will beD.will have