Richard Henry, An American physicist, is (36) ______a new calendar in which important days could fall on the same day of the week year after year. Instead of the familiar Gregorian (罗马教皇的) 365-day year with one (37) ______day added every four years. The new (38)______offers a 3-day year with a (39)______week every five or six years. Richard Henry has taught physics and (40) ______courses in Johns Hopkins University for nearly thirty years. Although the (41) ______remains essentially the same, the homework is due on different dates each year and the exam dates changed, too. So, each year, he has to make up a different (42) ______for his students. He said to himself, ’’I don’’t mind doing that because I have to do it.’’ But then one year I said, ’’Wait, I’’m a (43) ______astronomer. Let me see whether this is necessary or not.’’ And quickly I discovered that it is not necessary at all. That is because, (44)____________. An astronomical year set by the motion of the earth’’s rotation going a-round the sun is 365.2422 days long. And of course, 365 is not divisible by seven (45)____________. Each month in this revised year would have either 30 or 31 days, which means that eight months would be longer or shorter than they are now. (46)____________.