It is ___ the customers’ needs that has made chain stores so popular in big cities in China. [ ]

y ______himself, he ran out to thestreet.

How long has Mr. White __________ Joan—I’m not sure. Maybe they __________ five years ago.

Where do Dr. Kleitman and his assistant come from?—I’m not sure, but their English _____Australia.

Jim has gone to Britain to see a modern art exhibition— Oh, really? Do you know when he ?