只有通过努力，你才能在学习上取得进步。

2) Only then ________________________________________.

只有那时，她才意识到她的错误。

3) Only if you show interest in something _______ find it easy to learn.

A. you will B. will you C. you do D. do you

Step3 Testing

1. The man spent much of his childhood ________ (observe) birds in the wild.

2. Here they used to sit in the ______ (阴凉) through a long lazy summer's day.

3. The city hall is planning to start a ________ (运动) aimed at encouraging young people to work out regularly.

4. China has made great scientific ___________(成就) in outer space.

5. Child as he is, he b________ as if he were an adult.

6. As is known to all, WHO stands for the World Health O____________.

7. Yuan Longping, a s_____________ in rice, has made a great contribution to human society.

8. Hearing the news, the general commanded his troops to _________ (起程) at dawn.

9. Only by knowing yourself ______________ (你才能希望) to become an effective learner.

10.The people in Libya have gone through so many wars and they dream of _______________________ (过和平的生活).

Constant dripping wears away the stone.

锲而不舍，金石可镂。