Could you please check and correct the following exercises?

I. Put the verbs in brackets into the correct tense:
I've had a long career. If I (not/be/choose) hadn't been chosen to play the lead in my school play, I (not/become) wouldn't have became what I am today. I was only nine and I'm sure I (fell) felt nervous if I (not/have) wouldn't have my parents' support. They encouraged me to take dancing classes after that. If only I (not/refuse)........! I love dance now and if I (be) were younger, I (study) would study ballet. Apart from that, I don't have many regrets about my career. I wish I (perform) had performed more in the theatre, but I suppose if I (have) had, I (not/have) wouldn't have time to do so many film roles.

1. It's a pity that I wasn't given the position. (BEEN)
I wish I had been given the position.

2. The state of economy (improve) improves provided that there is a change of government.

3. You didn't make an appointment, so we can't see you tomorrow.
If you had made an appointment, you would see us tomorrow.

4. He's so gullible that he believed everything you said.
If he wasn't so gullible, he wouldn't have believed everything you said.

5. He doesn't listen to anyone's advice, so he didn't do what you suggested.
If he listened to anyone's advice, he would have done what you suggested.