4. what 改为 how。work 此处为不及物动词， 不可用连接代词 what 作宾语， 只可用连接副词 how 作状语。

3. it 改为 they。这里指代上文的 those classes。

2. 此行无错。

1. class 改为 classes。class 为可数名词， 根据下文， 这里 class 为复数， 故改为 classes。

10. return 改为 returns。return 此处为名词， many happy returns of the day 意为“祝你健康长寿”。

　I used to love science class-all of them-1. _______

　biology, chemistry ,geography, physics. I think I 2. _______

　liked those classes because I felt that it helped me 3. _______

　understand what the world works. For example, when4. _______

　I was a child , the rain was a mystery (奥秘). In one5. _______

　class, I learned it rained. I think science classes 6. _______

　clear up mysteries. But then there is always more 7. _______

　mysteries look into. What was my least favorite class? 8. _______

　That was maths. After learn the basics of the subject, 9. _______

　nothing else seemed very practically to me . I never 10.______

　saw how I could use it in my daily life.

　答案及解析

9. wonderful 前加 a。

8. 此行无错。

7. 删去 in。含有 this， that， last， next 等的时间状语前不加任何介词。

6. prepare 改为 preparing。与上文的 reading 形成平行结构， 以满足“spend some time on sth./in doing sth.这一句型的需要。

5. 删去 all。all 与 the whole 重复， 只能保留一处， 由于在此题型中， 只有多一个单词的可能， 故此处只能删去 all。