1. Two and two (make) four.
2. Hard works neve (go) waste.
3. She insisted to do this.
the 1st i'm not sure of. the 2nd should be hard work never goes to waste. it's a proverb.
the 3rd, it means she had a very strong feeling towards doing something and she counldn't be persuaded to change her mind. that's what the word 'insist' means.
hope this is of some help. :)