1 leave
2 When does the plane leave?
The plane will take off in ten minutes.
3 spent,was,swam,sunbathed
4 how long haven't you seen Mr. Bell?
I haven't seen
5 is going- will be
6 have just looked through - am going to
7 is clarifying
8 has become
9 is answering -works
10 do you often spend
Haven’t been