When it ______ advertising, consumers need to be educated about techniques used by advertisers.

—Have you heard the story of "The Merchant of Venice" —No. When and where does the story ______ ?

A great deal of science and technique has been______since China carried out reform and open policy.

 May I ______ you to write me a receipt?

Some of the rubbish, such as food, paper and iron, _____ away over a long period of time.