Seems you are quite familiar with Russia.—That is because I _________ the country in 1999

Which do you think is ____city,Beijing,Chongqing or Chengdu

下列各句中，加点的成语使用恰当的一项是(　　)

Isn’t that Ann’s husband over there?—No, it ______ be him-I’m sure he doesn’t wear glasses.

We should consider what use can we make ______ such material