36.
You should not discuss about a matter with friends who are likely to find it offensive.

37.
Students must give ears to what the teacher says.

38.
When the clock strikes twelve, I shall be waiting here for four hours.

39.
If you ask nicely, your sister will probably allow you have a piece of cake.

40.
His idea of reducing the quality of the article to cope up with the increasing market prices was not listened to.