Not until he promised to return it to me as soon as possible ____ my electronic dictionary to my classmate.

﹣I’m sorry I ________ my exercise book at home this morning．﹣It doesn’t matter．Don’t forget ________ it here this afternoon．

This is the first time that I _____ thesummer palace

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

It is important _________.