There are various options for evidence. A statement from your former spouse may be one.

Unlikely unless you maintained status. There may be some exception not presented in you question.

I was granted a pilitcal asylm 20eras ago and had to go back home to say the last good buy can i come back i had no travel doc?

Unlikely unless you became a US citizen or at a minimum a lawful resident of the US. Contact an immigration attorney for assistance.

What should I do if U.S. immigration has not notified me of an interview or its decision to lift restrictions off my green card?

This is not unusual. You make seek an extension and also make an inquiry with USCIS

I am an Indian born British citizen and I live in US on H1B, can I get citizenship in Canada or in Australia quicker?

This question should be directed to an attorney or consulate of the country that you are seeking citizenship. This thread is for US immigration

Car registration

Check with the DMV in your area for registration requirements. There is no immigration bar to owning a vehicle.

There is no set time for ICE to reply

Can I apply for a part time job with EAD/ AP without an approved I 140?

Yes you are permitted employment with an EAD and valid underlying basis for EAD,

Can my spouse start a job with EAD/AP?

When your spouse has an EAD your spouse may begin employment.

Why haven't i gotten the interview for citizenship

You should have been contacted and this juncture. Contact USCIS and make an inquiry either through customer service or through infopass.