What matters in life is ... (WHAT not in questions)

"Life is WHAT happens to you while you're busy making other plans."

WHAT = THE THING WHICH or THAT WHICH
 
Examples:

What I wanted to find out was where she was.
=
The thing which / That which I wanted to find out was where she was.

He refused to tell me what he had planned.
=
He refused to tell me the thing which / that which he had planned.

1. really concerned her was how unhappy the child was.

2. He told me he was felt quite confident.

3. Authorities have announced the elections will be postponed.

4. The letter showed clearly they were planning.

5. He gave the thief he had in his pockets.

6. I thought they would come with you.

Score =
Correct answers: