1 . The instructor reminded us to take care of our personal i________ (物品). (根据中英文提示单词拼写)

3 . 根据单词释义，选择正确的单词选项。

1. _______ n. a number of different things of the same general kind
2. _______ adj. large or important enough to have an effect or to be noticed
3. _______ adj. with a lot of decorations or bright colors
4. _______ adj. means involving or relating to the buying and selling of goods
5. _______ v. to say that you are annoyed, unhappy, or not satisfied with something.
6. _______ adv. a way of emphasizing that something is true and that there is no doubt about it
7. _______ v. to speak very quietly to sb. so that other people cannot hear what you are saying
8. _______ adj. amusing and making you laugh
9. _______ adj. connected with money, possessions, etc. rather than with the needs of the mind or spirit
10. _______ n. a single article or object

4 . —What does PM 2.5 mean?
—It's a professional ________ indicating the condition of air pollution.

A．term

B．item

C．number

D．mark