19. Members may keep books for 3 weeks.

• Books may be kept by members for 3 weeks.

20. Passengers shouldn't throw away their tickets.

• Tickets shouldn't be thrown away by passengers.

21. Parents should give children a lot of love.

• Children should be given a lot of love by parents.

22. Governments should offer poor women more help.

• Poor women should be offered more help by governments.

23. We must do something before it's too late.

• Something must be done before it's too late.