| 1. | Describe a circle on the floor with a piece of chalk 用一支粉笔在地板上画个圈。 |
| 2. | Describe a circle on the floor with a piece of chalk 在地板上用支粉笔画个圆。 |
| 3. | He is writing on the blackboard with a piece of chalk 他正用一支粉笔在黑板上写字。 |
| 4. | He filched a piece of chalk from the teacher ' s desk 他从老师的书桌上偷取一支粉笔。 |
| 5. | The teacher wrote on the blackboard with a piece of chalk 老师用一支粉笔在黑板上写字。 |
| 6. | The teacher wrote on the blackboard with a piece of chalk 老师用一支粉笔在黑板上写字。 |
| 7. | I stepped onto the platform and picked up a piece of chalk 我走上了讲台,拿起了一支粉笔。 |
| 8. | He crushed a piece of chalk to powder 他将一支粉笔压成粉末。 |
| 9. | Can you give me a piece of chalk 你能给我一支粉笔吗 |
| 10. | Put a piece of chalk in water for 24 hours . what happens ? why 投入粉笔在水中24个小时。什么发生?为什么? |