It was foolish of him to _______his note during that important test, and as a result, he got punished. 

The Mid-Autumn Day, which is a day for family reunion in China, _____ on September 12th this year.

If this plan works, we'll ______ in a special way,say, holding a tea get-together.

We _____ know things about each other that we should not know, have no right _____, and have a right, actually, not to know.

 You should visit your parents _____, even when you are very busy.