．Researchers from MIT, Harvard reported a study of human brains yesterday that may______ some new information for mental illnesses.

Martin Luther King was killed ________ April 4, 1986 _______ American history.

Have you got any particular plans for the coming holiday?— Yes. _____, I’m going to visit some homes for the old in the city.[ ]

The parking meters are installed in streets to record and show the time _____ a driver has paid for is finished

Finally an agreement _________ after they had two-day discussion.