3 . 桂林是一个美丽的城市，龙脊梯田坐落于此。（介词+which的定语从句，龙脊梯田the Longi Rice Terraces）(汉译英)

4 . I will publish my results only when I have ________ my research.

A．began

B．concluded

C．reported

D．read

5 . 选词填空

subscribe,       convince,       cast,       boost,       bacterium,       alternative, severe,       decrease,       thanks to,       devote,       in spite of,       estimate,       blame

1. It___________ that one farmer on a cotton-picking machine can harvest as much in a day as 100 people working by hand.
2. The___________ were then examined under a microscope.
3. A great person is someone whose life___________ to helping others.
4. My reason for___________ to Teens every term is that it can help me practice my English.
5. Sunny and Fanny are seeking___________ to riding. They will probably choose to walk as much as possible.
6. The bright moon hung high in the sky and the building___________ its shadow across the street.
7. With the number of animals___________, many people are more concerned about the environment.
8. Peter stood up in defense of the 16-year-old boy, saying that he was not the one___________.
9. ___________ the rain, the picnic was canceled.

6 . _________ you try to do something beyond what you have already mastered, you will never grow.

A．Once

B．If

C．Because

D．Unless

9 . Before I could reply, ________ ________ ________ ________ ________ ________ ________（两个男学生中较高的那一个）, Dai Tao, offered to share most of my loads, whose name I got to know later. （根据汉语提示完成句子）