Circle the correct answer

2 Circle the correct answer.
7 I'm sorry I'm not able to / couldn't meet you
yesterday. I was busy all day.
8 I'm looking for my address book. It must /
couldn't be here somewhere.
9 When Steven pushed the door, he was able
to / could open it.
10 Club members are allowed to / would bring a
friend once a month.
11 Could / Shall you open the door for me,
please?
12 Before she got her own car, Kali could / can
borrow her mother's car.