Unit 1　The summer holidays

1. The students should master the following important vocabulary:
　　introduce, practice, vacation, employ, regards, expression, physics, 　　　　chemistry, biology, geography, go away, in one's opinion, general idea, go on doing, as a result
2. The students should know the meaning of the following useful expressions and besides that they should know how to use them in their daily life.
　　(1) I must be off now./ I must be leaving. / I must go now.
　　(2) Nice to meet you. / Nice meeting you.
　　(3) I'll introduce you ( to my friends ).
　　(4) Give one's regards / best wishes / love to sb.
　　(5) That's nice/ kind of you.
　　(6) See you soon. / See you later. / See you tomorrow.
2. The students must grasp the following sentence structure.
　　(1) So + be/ have/ 助动词/情态动词+ 主语
　　(2) prefer的用法
　　It's one's turn to do sth.