I used to love science class—all of them—                 86. _______    
biology, chemistry, geography, physics.I think I            87. _______    
liked those classes because I felt that it helped me        88. _______    
understand what the world works. For example, when          89. _______    
I was a child, the rain was a mystery(奥秘).In one          90. _______    
class, I learned it rained. I think science classes        91. _______    
clear up mysteries. But then there is always more          92. _______    
mysteries look into. What was my least favourite class?    93. _______    
That was math. After learn the basics of the subject,      94. _______    
nothing else seemed very practically to me. I never         95. _______    
saw how I could use it in my daily life.