根据句意和中文注释，在答题卷相应的横线上写出所给单词的正确形式。
It is well known that UNICEF is an __________________ (国际) organization.
The___________ finally got to the top of the mountain. （亲戚）
What about___________（预订）a room for my best friend from Shanghai?
--- Have you ______________(收到) his invitation yet? ---No, I haven’t.