Read the text and fill in the gaps with the correct form of the given words

Have you ever heard about any strange school rules? Here are some of them which you might find amusing and ... strange.

The most [ ] rule in Japanese schools is a ban on dying hair. In about 57% of public schools in Tokyo, students are strictly prohibited from dying their hair. Students are required to prove that their hair colour is natural. Such a strange rule is connected with the culture of the country. The Japanese pay close attention to [ ] and it must be followed even in the pupils' hair colour.

A unique rule exists in Chinese schools. Here, students are allowed to take half-hour nap breaks in the middle of the day. Teachers are confident that this improves memory and [ ] and helps to study better. Junior students can sleep right on their desks and even bring a blanket and pillow with them. High school students are allowed to sleep while sitting.

In Vietnam, yoga classes have become an interesting [ ] in kindergartens and schools. Lessons are held in the lotus position. Children relax and listen to wise fables*. On average, students do yoga for about an hour per week. Such classes can be also chosen as an [ ] course.

The UK [ ] prohibits schoolchildren aged 11-18 years from using slang. Any abbreviations and even informal greetings and farewells in the form of "Hey" and "See ya" are prohibited in schools. Officials believe that children should speak only literary English. This will help improve the culture of speech and expand the students' vocabulary.
*fable — a short story that tells a general truth or is only partly based on fact or literature of this type