MAC 3 - Tag Questions - Special Cases

I'm sure it is true, (a)   ?

Paul worked for BBC, (a)   ?

Jane's siblings haven't voted before, (a)   ?

Let's have a break, (a)   ?

Don't forget to reply her email, (a)   ?

Someone called her last night, (a)   ?

Please, send me his phone number, (a)   ?

There is a mosque in that street, (a)   ?

Let's not stay too late tonight, (a)   ?

nobody is planning to visit him at the hospital, (a)   ?