Помогите пожалуйста
1) I... all the exams when summer begins
a)hadn't passed b)haven't passed c)didn't pass d)won't have passed
2) If she had studied, she... the exam
a)had passed b)must have passed c)would have passed d)passed
3) She... close to where she works because she walks to work
a)can't have lived b)must live c)might live d)must have lived