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1)Who sometimes has to work at night?

2)Who never turns off their mobile phone?

3)What might 24-7 mean?

4)Who could smoke at work in the past?

5)Can he/she smoke at work now ? Why /Why not?

6)Who mustn’t be rude?

1) Paula sometimes have to work at night,'on call'.

2) Paula and all doctors never turns off their mobile phone.

3) It means schedule,or 24 hours a day and 7 days a week.

4) No one can smoke at the past.

5) He can't smoke at work now,because these are rules of this cafe.

6) People who smokes in this cafe mustn't be rude.