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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.

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