—Can you come to my birthday party on Sunday, Mike?
—Sorry, I_____. I have to look after my little sister.
A.can’t B.may C.mustn’t
English is the most _____ spoken language in the world.
A.quickly B.carefully C.widely
My math teacher lives an active life. She looks as _____as she was ten years ago.
A.young B.younger C.the youngest
To keep children away from danger, we warn parents_____ children at home alone.
A.not leave B.to leave C.not to leave
To keep our friendship, we should not just think about _____.
A.ourselves B.yourself C.myself
You can take_____ of the two toy cars and leave the other for your brother.
A.all B.both C.either
