Обведите правильный вариант

1 Tom and Edward ...
a) have 15 years b) is 15 years old
c) are 15 years old

2. Paul ...doctor.
a) isn't a b) aren't c) isn't

3. A: What's the time? B: ...11 o'clock
a) Is b) It c) It's

4. A: Are you my son? B: No, ..
a) I'm not b) I amn't c) I am

5. A: ...today? B: No, it isn't . It's warm.