(too...to...)，所以玛丽不得不步行回家。黑暗中一个人也看不见(in sight)，玛丽非常害怕。她多么希望(wish for)有人能来帮她(come to one's aid)一下！这时一只手伸过来(reach out)并抓住(grasp)了她的胳膊。玛丽有点担心(anxious)，她抬头看到(stare up at)一个年轻人。原来是她的同学。现在她知道自己可以安全地回家了。

　　【参考范文】

　　Yesterday the city was covered in a thick fog.It was too foggy for the bus to run，so Mary had to walk home.There being no one in sight in the darkness，Mary felt very frightened.How she wished for someone to come to her aid! Just then a hand reached out and grasped her arm.Mary was a little anxious and stared up at a young man.It was her classmate.Now she knew she could get home safely.

IV.阅读理解

　　Try this：For an entire day，forget about the clock.Eat when you're hungry and sleep when you're tired.What do you think will happen?

　　You may be surprised to find that your day is much like most other days.You'll probably get hungry when you normally eat and tired when you normally sleep.Even though you don't know what time it is，your body does.

　　These patterns of daily life are called circadian rhythms，and they are more than just habits.Inside our bodies are several clock­like systems that follow a roughly 24­hour cycle.Throughout the day and night，our inner clocks direct changes in temperature，body chemicals，hunger，sleepiness and more.

　　Everyone's rhythms are different，which is why you might like to stay up late while your sister always wants to go to bed early.

Learning about our body clocks may help scientists understand why problems arise when we act out of step with our circadian rhythms.For example，traveling across time zones can make people wake up in the middle of the night.Regularly staying up late can make kids do worse in tests.