Помогите с английским пожалуйста
6.Choose the correct preposition.
1. The boy (sharpening sharpened) a pencil is my brother. 2. They spent all day in the park (playing/played) football. 3. They drank only (boiling / boiled) water. 4. I always buy (slicing / sliced) bread. 5. She talked over the telephone (slicing sliced) bread. 6. Would you like some (mashing / mashed) potatoes?