_________ to sunlight for too much time will do harm to one's skin.
—What should I do with this passage? —__________ the main idea of each paragraph.
We __________ him __________ his winning the first prize.
John is ill and has been __________ by Tom in our team in tomorrow's football match.
She concentrated her energies __________ her test.
My deskmate and Tom are similar __________ each other __________ character.