题目内容：

语法填空

One sheep, two sheep... 632 sheep... still awake...

People always believe that counting sheep1.(be) helpful to their sleep. But does it2.(real) work?

Scientists at Oxford University tested it. Two sleep researchers looked at the people who had3.(difficult) in sleeping. They divided them4.different groups. Then they asked them to try all kinds of ways to help5.(they) fall asleep quickly.

Surprisingly, it6.(take) those who were asked to count sheep more time to fall asleep than those who weren’t. But when they were asked to imagine a relaxing picture-- a beach, for e7., they fell asleep about twenty minutes8.(soon) than before, according to a report in The New York Times.

“Sometimes, counting tasks are OK, b9.they are thought as stressful by many people,” Dr. Richards told ABC News.

“As10.result, it may be a good way to try imagining colored fish slowly swimming in a river to help you sleep at night,” suggested Richards.