—Dad, when shall we go to visit my grandpa?—Grandpa is very busy at present.We'll go to see him whenever __________.
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.
The company,__________ in 2003, is one of the most famous compa-nies.