题目内容：

It was almost midnight, but Mary couldn’t fall asleep. “One sheep, two sheep…” She  1. (start) to count sheep. But did it really work? Actually, some  2.  (scientist) believe this may not be a very good way to fall asleep. Some people try so hard to count that they can be more clear-headed. Instead, they can try taking a bath to fall asleep. They can also think about a quiet beach or a walk in the woods,  3. can make them relaxed and fall asleep more  4. (quick).