1 . A holiday isn’t an ________ (可有可无的) extra. In this stressful world, it’s a must.

2 . Certain courses are compulsory, while others are o_______.

3 . According to Professor Smith, we don’t have to read the book if we don’t want to, as it is ________.

A．necessary

B．informal

C．individual

D．optional

4 . As a senior next year, I think extra periods should be used to take __________(option) subjects．

5 . The course this term is not o______ (可有可无的), but required. (根据汉语提示单词拼写）

6 . Chinese Calligraphy is one of the many ____ courses offered to students who are interested in traditional art.（根据课文内容填空）

7 . In that school, German is compulsory for all students, but English and French are ________.

A．special

B．regional

C．optional

D．original

8 . According to Professor Johnson, we don’t have to read the book if we don’t want to, as it is ______.

A．worthwhile

B．necessary

C．optional

D．serious

9 . 用方框内所给单词的适当形式填空

1. Without official______________, you are not ______________to run the company.
2. The robber was caught on the______________. I ______________all that had happened.
3. As a teacher, you should always be ______________with all the students.
4. He insisted on ______________100dollars for the final match, and he thought it was a sure______________.
5. "It is bad ______________to talk too loudly in public," I said to him in a polite______________.
6. He ______________his friendship with me by talking over the phone.
7. If I have nothing wrong, why should I make an ______________to you?
8. He jumped into the cold water to save the drowning girl without______________.
9. I will show you three ______________gifts, and you can choose one from them.
10. Everyone has his own way of ______________who he falls in love with.

10 . Currently car insurance is not _______ in the annual inspection; all the vehicles are required to register insurance covering safety and property.

A．temporary

B．optional

C．arbitrary

D．confidential