29.

1. Now may farmers have reverted to traditional farming methods, ________ their ancestors’ way to handle specific pest or disease problems.

2. _________ it is possible that genes have some influence, I find it hard to believe that they would count for more than all the thousands of experiences each person has.

17.Hydrogen is one of the most important elements in the universe _______ it provides the building blocks from which the other elements are produced.

33.磊磊参加的合唱团少来了一个人，没人发现，但今天少来了两人，磊磊一下就发现了，这说明磊磊（ ）能力强。

37.

23.

27.

40.

32.刘老师会在每次考试前提醒学生好好复习，根据桑代克的基本规律，这是（ ）的体现。

25.

31.张老师认为教育就是为了要让学生学习知识，把握学习内容。张老师遵循的理论是（ ）。