10 English questions!(fragment, grief, gross, harsh, inherent, intuition, juvenile, neutral...

Can you pleas correct my grammar??
I would like to use these words.

(fragment, grief, gross, harsh, inherent, intuition, juvenile, neutral, notorious, nourishment)

1. Use some fragments of wood to make fire.  Not commonly used to describe pieces of wood.

2. Many people in Japan have depression problems. They must be living with grief. I want to help them.

3. Vacuum cleaners in Canada are very heavy. The gross weight is about 10 kg.

4. My ex boss was very harsh to workers. I really did not like working there.

5. Teamwork skills are inherent in monkeys.

6. When a partner cheats, I can tell by intuition.

7. There are many ways to prevent juvenile deliquency.

8. I usually assume a neutral attitude to people I am not interested in.
(Can I also say I like neutral fashion?) Yes, but the meaning might come across as neutral-colored fashion.

9. My ex boss is notorious lol Might want to continue that sentence...notorious for what?

10. Please watch your diet. Good nourishment is very important.