a.1.B: I'm proud of you
2.:You should stay at home.
3.B:I don't think so.He might be busy.
4.B:I have no idea,I wasn't at home.
5.B:It would be great,thank you.
b1.have lived
2.am
3.If he had studied
4.has he?
5.went
c.2.I become used to driving on the left
3.She recently took over the sales departament.
4.When do you take up with your new job?
5.I quit going to gym classes