--Who’s the man over there?Is it Mr Black?----It _____be him.He’s much taller.
—_______ you read the words in English? —No, I can’t. They are too difficult for me.
Most students think Liu Xiang is one of _______ sports stars in China.
—_______ are you going to visit the science museum? —Next Saturday.
I want to buy some postcards in the shop, _______ I don’t have enough money.
My mother always gets up _______ 6 o’clock in the morning.