The earth is in great danger now.We have to do something _______ it.( )
A.protectB.protectingC.to protectD.protected
Must I wait here all morning?I have a lot of work to do.
No,you____.You may be back in the afternoon.( )
A.mustn'tB.can't
C.don't have to
Grandma is rather deaf,so you must speak clearly and___to her.( )
A.quietlyB.loudlyC.noisily
I'd like to hold our next meeting____June 23rd.Is that OK for you?( )
A.inB.atC.on
s Tom____boy in your class?
Yes.Nobody is taller than him.( )
A.the tallestB.the strongest
C.the cleverest
Whose bike is this?
It's______.My grandpa bought it for me as a birthday present.( )
A.hisB.mineC.hers