____ for a bus, I was reading a magazine.

Why do you insist on buying a car ______ you have such good public transportation here?

．We are taught that a business letter should be written in a formal style ____ in a personal one． 

Dr Yuan Longping grows ________ is called super hybrid rice, _________ has a high output.

 He pointed to ______ looked like a tomb and said, “Ghost.”