一、记单词，背句子
1、 classmate [ˈklɑ:smeɪt]
n.同班同学
Tom and Mary are not classmates. 汤姆和玛丽不是同班同学。
That beautiful girl is my classmate. 那个漂亮的女孩是我同学。
2、useful [ˈju:sfl]
adj.有用的；有益的参考例句：
The horse is a useful animal. 马是有用的动物。
He's a useful member of the team. 他是该队的一名强手。
3、replied [rɪ'plaɪd]
v.[法律]（原告对被告）答辩( reply的过去式和过去分词 )；反响；作答；以行动做出反应
She replied in a measured tone to his threat. 她以很有分寸的语气回答了他的威胁。
I gathered from the way she replied that she wasn't very enthusiastic. 从她回答的语气判断，我觉得她不很热心。
4、 daytime [ˈdeɪtaɪm]
n.白天，日间参考例句：
You can't see them in the daytime. 在白天，你看不见他们。
We must finish it in the daytime. 我们必须在白天完成这件事。
5、nobody [ˈnəʊbədi]
pron.无人，没有任何人参考例句：
Nobody is in the house. 没有人在房子里。
Nobody knows where she lives. 没有人知道她住哪里。
6、course [kɔ:s]
n.课程，讲座，过程，路线，一道(菜)
The college course was then cut to three years. 大学学制那时缩短到三年。
Of course, I don't always sleep in the afternoons. 当然，我并不总是在下午睡觉。
7、of course [əv'kɔ:s]
当然；自然；无疑
Of course, I remember him. 我当然记得他。
Of course, I don't always sleep in the afternoons.当然，我并不总是在下午睡觉。
二、单词活用，阅读提升
Tom and his classmate，Jerry，are talking about the sun and the moon. Jerry asks，"Which of them is more useful?”
汤姆和他的同学杰瑞正在讨论太阳和月亮的话题。杰瑞问:“它们中哪一个更有用?”
Tom replied，"Of course，the moon is. The moon is in the sky when it is dark，but the sun is in the sky in the daytime when nobody needs it.”
汤姆回答道:“当然是月亮。月亮在天黑的时候挂在天空。可是太阳是在白天谁也不需要它的时候出现在天空。”
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