1) Smoking
isn't allowed at this restaurant.
2) Your bill should be paid before you leave the hotel.
3) The children have been told about the party.
4) This programme is being watched by about thirty million people.
5) Students are expected not to talk during the examination.
6) This button mustn't be touched while the experiment is in progress.
7) A whistle will be blown if there's an emergency.
8) Flowers should be kept in a warm sunny place.
9) My chair has been moved by someone.
10) Mr and Mrs Davidson are being questioned by the police.
11) Two hundred people were invited to the wedding.