Выберите правильный вариант и заполните пропуски.

8 If I am not too busy, I … to the concert.

a) go b) will go c) to go

9 If we were in America, we … to see Washington.

a) will go b) go c) would go

10 If they … his address, they would write him a letter.

a) knew b) know c) would know

11 If he …………. hard, he would have achieved great progress.

a) works b) worked c) had worked

12 If I …………. a princess, I would live in a palace.

a) be b) was c) wer