阅读短文，在空白处填入一个适当的单词或用所给单词的正确形式填空。
I'm Leo, an exchange student from Canada. I'll talk about the rules in my new Chinese school.
The rules here are quite different! First, we must wear school uniforms every day. It is a little strict. 1. it helps everyone look tidy and equal. Another rule is that we must arrive at school 2. time. Our teacher always says, "3. (do not) be late for class!" If we are late 4. than three times, our teacher will tell our parents. It teaches us to 5. (respect) others' time. We also have a rule about mobile phones. We can bring them to school, but we must keep them in our 6. (locker). Using phones in class is 7. (polite). We need to focus on learning. The most interesting rule is that we must take turns cleaning our classroom. At first, I didn't like it. But now I see it's our duty 8. (keep) the classroom clean. Following these rules 9. (be) not always easy, but they help 10. (we) become better and more responsible.

1. But 2. on 3. Don't 4. more 5. respect 6. lockers 7. impolite 8. to keep 9. is 10. us

1. 考查连词，前文提到穿校服的规定有点严格，后文说明它能让所有人看起来整洁平等，前后为转折关系，填But。
2. 考查固定搭配，on time是固定短语，意为“准时”，符合语境，填on。
3. 考查否定祈使句结构，否定祈使句以Do not的缩写Don't开头，句首首字母大写，填Don't。
4. 考查固定搭配，more than意为“超过、多于”，符合“迟到超过三次老师就通知家长”的语境，填more。
5. 考查非谓语动词，固定结构teach sb. to do sth. 意为“教某人做某事”，to后接动词原形，填respect。
6. 考查名词复数，our意为“我们的”，后接可数名词复数，locker的复数形式是lockers，填lockers。
7. 考查形容词词义，根据“上课要专注学习”的语境，上课用手机是不礼貌的，polite的反义词为impolite，填impolite。
8. 考查固定句型，It's one's duty to do sth. 是固定句型，意为“做某事是某人的职责”，填to keep。
9. 考查主谓一致，动名词短语Following these rules作主语，谓语动词用单数，句子为一般现在时，be动词用is，填is。
10. 考查人称代词宾格，动词help后接人称代词宾格作宾语，we的宾格形式是us，填us。