In recent years， with more and more cars on the road，flying robots are used to deliver（递送） mails．Flying robots can（1） 　　mails to people's houses without having to deal with heavy（2） 　　．But they will spend too much time in returning． A research center is trying to improve its flying robots with the（3） 　　of homing pigeons（信鸽）．

   Homing pigeons are pigeons that are（4） 　　trained to fly home from somewhere else．In tests，researchers（5） 　　that homing pigeons were（6） 　　efficient（高效的） than flying robots at returning to their home． So the research center is trying to use a flying robot， together with a（7） 　　， to deliver mails． After the robot finishes its tasks， it can（8） 　　the pigeon back in the shortest possible time．

   Although it will cost more money to（9） 　　pigeons， the research center says that it can（10） 　　time． And the time it saves will make up for the cost．

（1）A． invite	B． carry	C． blow	D． kick
（2）A． traffic	B． rain	C． fire	D． pollution
（3）A． help	B． luck	C． treat	D． interest
（4）A． poorly	B． carelessly	C． specially	D． musically
（5）A． promised	B． joked	C． planned	D． found
（6）A． less	B． more	C． little	D． much
（7）A． homing pigeon	B． big house	C． leading person	D． heavy car
（8）A． train	B． knock	C． follow	D． steal
（9）A． dress	B． paint	C． clean	D． raise
（10）A． expect	B． show	C． kill	D． save