重点单词： 表示学习用品等事物的单词：pen，pencil等。
指示代词： this, that
介词： at, in
重点短语： pencil case, pencil sharpener, computer game, lost and found, a set of, school ID card, call sb. at ...
重点句型：
1. —Is this / that your pencil?
—Yes, it is. / No, it isn’t.
2. —What’s this in English?
—It’s a pen.
