Is this your baseball, David? —No, it’s not . It’s Helen’s.
A:Why do Chinese people like red?B:Because they think it can _____them good luck.
It is hard to imagine what life __________ in 100 years.
In North America, most students go to school _____ the school bus.
Mum, have you seen my mobile phone?—_________you bought last week? I’m sorry I haven’t seen _________.