—_____of Hangzhou has your brother covered since he came here?—About half of it, I guess

He trained hard in puzzle-guessing, a sort of children’s game, all year, _____ still failed to reach his best form in all the tests given to both adults and children. 

_____ three influenza type A virus subtypes(子类型) have been found in pigs.

I would like to give you some money, but _______I haven’t got any.

Lizzie was______ to see her friend off at the airport.