1 . English is compulsory for all students, but art and music are ______ (选修的).   (根据汉语提示单词拼写)

2 . Certain courses are compulsory (必修的), while others are o ______. (根据首字母单词拼写)

3 . Chinese Calligraphy is one of the ________ (选择) courses offered to students. (根据汉语提示单词拼写)

4 . Unlike Chinese or Maths, Poetry is one of the many o______ courses that the school offers. (根据首字母单词拼写)

5 . Russia is an o________ (可选择的，选修的) course to students in our school. (根据中英文提示填空)

6 . Taking o________ (选修的) subjects will enrich our mind.(根据中英文提示填空)

7 . This course is o________. You don’t have to take it. (根据首字母单词拼写)

8 . In that school, French and Russian are o________ courses, but English is required for all students. (根据首字母单词拼写)

9 . There are many ________(可选择的）courses in our school. （根据汉语提示单词拼写）

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