4. 如果不冒险，任何人都不可能轻易实现他的梦想。(risk) 

Anyone can't achieve his dream easily without           .

3. 只有在你被追逐的时候，你才会快跑。

           you are pursued           you become swift. (It is only+从句+ that...)

2. 列举数例，用以说明这一原理。

          to demonstrate this principle(here的倒装句)

1. 有时我想知道我们是否能到达那里。

There were times when I wondered        we would get there.(whether…or…)

8. Don't          (担心) that too much. It's nothing but a quiz.

7.          (不只是一个) answer is to your question.

6. You will           (得出错误的判断) if you reason from false premises (前提) .

5. The first signs of spring are          (显然可见) .

4. It's very noble of you to          (照顾) my old grandmother when I was out for business.

3. Thousands of children          (感染) HIV every day.