用所给单词的适当形式填空。
1. My best friend is from __________ (Japanese).
2. This is the __________ (begin) of the garden tour.
3. The koalas often sleep during the day and eat __________ (leaf) at night.
4. Don't play football in the street. It's __________ (danger).
5. Are they __________ (friend) to you?