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