根据句意和汉语提示，完成单词。

1. It is very difficult to make correct _____(决定)all the time.

2. Do you remember your _____(父母)birthdays?

3. If you know anyone else who _____(收集) stamps, please tell me.

4. It's _____(有必要的)for us to master some life skills.

5. Have you ever felt tired in the middle of the day, _____(尤其)after lunch?