People traveling long distances frequently have to decide ______they would prefer to go by land, sea or air.

The best job is _____which uses your skill in doing something together with your interest in the subject. 

Don’t forget to bring a dictionary next class. ___. I didn’t catch what you said.

  Can you tell me ______ that the 29th Olympic Games will take place?

“_____ when does the pub stay open？”  “About midnight.”