43. Some teachers today are                     (对学生的要求过于严厉) .(hard)

42. It's               (把这张漂亮的桌子用桌布盖起来真是可惜) .( shame)

41. You have to              (等上几个小时让这些衣服干透) .( couple )

40. —Mary is going to my house for dinner tonight.

—You                  (应该尽你所能让她有宾至如归的感觉) .(suppose)

39.             (如果你戒掉酒) ，you'll feel much healthier. (cut)

38. It is the parents'job             (在家中为他们的孩子提供一个干净、舒适的环境) .(provide)

37. The old man              (习惯了住在乡村的) will feel lonely in the city.(use)

36. We should                    (努力帮助保护动物) .(effort)

35. You can discuss your problems with your parents                (因为他们有许多经验) .(have)

34. The environment              (将会处在极大的危险之中) .(be)