写单词。 1. Can you name the four great ___________(发明) of China? 2. About ten ___________(百分之) packaging is plastic. 3. The Rocky ___________(山脉；山峰) are the biggest ones in North America. 4. ___________(地理) is the study of the world's places. 5. We ___________(成功) to have the broken bike repaired well. We are very happy. 6. Maybe in the future all the cars, buses will be ___________(电的) 7. We use wood from trees to build houses and ___________(家具) 8. The rose is one of the ___________(漂亮) plants in the world. 9. Let's do the ___________(试验) and see what happens. 10. ___________(保护) the environment is everyone's duty.