Whose book is this —It _____ be Mary’s. Mo Yan is her favorite author. —No, it ____ be hers, she never brings novels toschool.

_______this problem, they don’t know how to deal with it. [ ]

Lily, could you help to feed my cat while I’m away —__________.

Do you mind if I turn on the air-conditioner —___________. I feel a bit hot.

The Kings have been in Beijing for threeyears, so they are familiar ____ the city.