Bob and David are friends. __________ of them work in the art club as volunteers.
. - Excuse me. is this_______ iPad mini? - No, it isn't. _______ is at home.
Which of the following we can’t use when we make a telephone call?
Do you know the way __________ ?
It's about_______ from our school to my home.
Guangzhou is _____ the south of China.