30．They are letting us use their computer, and __________ we are giving them the results of our research．

　　　 A．in charge　　　　　　 B．in place　　　　　　　 C．in return　　　　　　　 D．in a row

29．There was a murder in one of the poorest suburbs in the city the other day．Now the police are turning the whole house upside down __________ of clues．

　　　 A．in want of　　　　　 B．in search of　　　　 C．in favor of　　　　　 D．in memory of

28．The local government has been accused of not responding __________ to the needs of the homeless in the flood-stricken area．

　　　 A．hopelessly　　　　　 B．appropriately　　　　 C．needlessly　　　　　　 D．constantly