Conditional Sentences

What...........(you/do) if you had missed the train?

What ........(you/do) if you .........(be) the head teacher of your school?

If I............(not/pass) my exams, my parents wouldn't be very happy.

If I got detention, I..........(not be able) to go to my piano lesson.

If the hero...........(not/save) them, they would all have been killed.

If you mix red and green, you ..........(get) yellow.

My parents...............(not /let) me go out unless I do my homework first.

She wouldn't have read the book if she............(not/see) the film first.

If pupils break the rules, they..........(get) detention.

If Harry Potter had sold fewer copies, .............(JK Rowling/become) a millionaire?