Заполните пропуски. Ward Sister Sarah Brown is responsible for the welfare

Заполните пропуски.
Ward Sister Sarah Brown is responsible for the welfare of 28 patients on two wards at London hospital where she (A1) for the last 6 years. She (A2) a staff of 12 people. There are also 15 students nurses who (A3) to the ward at any time. It (A4) , she says, that 200 people doctors, nurses, students, visitors (A5) through her wards every day. Sister Brown, who is 39, (A6) as a nurse 20 years ago.
A1. 1) worked; 2) was working; 3) had worked; 4) has been working.
A2. 1) directs; 2) is directed; 3) has directed; 4) has been directing.
A3. 1) assigned; 2) have been assigned; 3) have assigned; 4) are assigned.
A4. 1) has been calculated; 2) is calculate; 3) had been calculated; 4) calculates.
A5. 1) have moved; 2) is moving; 3) are moving; 4) moved.
A6. 1) were qualified; 2) was qualified; 3) qualify; 4) has been qualified.