根据句意和括号内单词提示，在空白处填入其适当形式，必要时可加其它的单词。

1. She has to make some very difficult __________ (decide).

2. I don't answer questions about my __________ (person) life.

3. She lay _________ (wake) last night, thinking of the matter.

4. You should be careful when you _________ (cross) the street.

5. They seem _________ (know) what they're doing.

6. I ________ (not see) my aunt for 16 years.

7. You know that I don't like ________ (argue) over money.