他用砂纸打磨木材使其表面变得粗糙。
He used sandpaper to ___roughen the surface of the wood.
多年的海上生活让他的性格变得粗犷起来。
Years at sea have ___roughened his personality.
她用砂纸把木板表面磨粗糙以便上漆。
She ___roughened the board's surface with sandpaper before painting it.