（湖南省怀化市2014年高三第二次模拟考试）35. So mysteriously ______ missing that many puzzles wait to be solved.

Do you think it’s a good idea to make friends withyour students–––________, I do. I think it’s a great idea.

You’d better exercise at least three times a week ______ you can keep fit.

There are ________ days in a year.

Sarah hopes to become a friend of shares her interests