1 . At first he refused to admit ______ in the exam, but when he was shown the evidence he ______ and admitted it.

A．to cheat; broke down	B．to cheat; broke away
C．cheating; broke away	D．cheating; broke down

2 . To prevent it ________ (come), the government is planting trees. (所给词的适当形式填空)

3 . You can reduce your stress by ________ （组织）your work and time better. （根据汉语提示单词拼写）

4 . Dr.Yuan invents super hybrid rice, making it possible to increase rice harvest without e___________(扩大；伸展)the area of the field. (根据汉语提示单词拼写)