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

It is an abundance of cheap goods and quick delivery service ______ account for the fact that the number of Internet shopping on this website is four times ______ it was last year.

It was what he meant rather than what he said ______ annoyed me.

  —Did you return the book on me? Why can’t I find it anywhere?—_______. You were writing a letter at your desk at that time.

It was because of the bad weather _________ the football match had to be put off.