11. Joe is the most intelligent boy in the school.
12. Do you think teenagers are generally irresponsible?
13. There aren't any books about how to control negative feelings.
14. We must wear uniforms for school activities every month.
15. The baby's illness is much worse than we thought at first.
16. His uncle decided to take off his wet boots last night.
17. Put the flour into a bowl, blend with a little milk, then beat in the egg yolks.
18. Passengers mustn't undo their seat belts until the signs have been switched off.
19. Where there is little rain, grass and trees become thinner.
20. It would be irresponsible not to turn up for work without calling.