What have you been doing?

I´m exhausted. I´ve ... working in the garden all afternoon.
1. be
2. been
3. -
What ... she been reading lately?
1. has
2. have
3. is
Politicians have been ... the new regulations for hours.
1. discuss
2. discusses
3. discussing
You look awful! What have you ... doing?
1. being
2. been
3. be