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You have probably heard of homing pigeons，which usually appeared in wars.From 3000 B．C.to the present，homing pigeons have ____ as postmen.They have been especially useful for carrying messages ____ wars.The telegraph is not ____ to carry about.Sometimes only the little pigeon can take a message where it ought to go.
In 1870，when the Prussians surrounded the city of Paris，the city was cut off from all the ____ means of communication.The people ____ many different ways of sending news.One way was to let go small balloons carrying mail.____ of course，they only drifted (漂) ____ the wind carried them.Often they landed inside the enemy’s lines.Even balloons large enough to carry a pilot could hardly be ____ controlled.
It was pigeons that in the end solved the ____.Homing pigeons were brought into the city.Soon they were carrying letters far and wide.The enemy brought ____ to catch pigeons，but the little postmen could fly faster than their ____.Strangely enough，pigeons played an important ____ in war.
During the First World War every army unit had a group of pigeons ____.Many of them were ____.Among them was an American pigeon with a French name Cher Ami，which meant“dear friend”．A group of US soldiers were surrounded by the enemy.They had no food and no bullets.They nearly died of ____.There was little hope for them.Cher Ami made his way ____ the bullets and succeeded.At once planes ____ to drop food and ammunition (军火) to them.With their strength ____，the soldiers fought back to their own army and got saved.
____ can pigeons carry the message？There were various methods.Usually the message is put into a little glass tube.The tube is tied to the leg or hidden under ____ or hung around the neck.

A．considered B．served C．regarded D．made

A．in favour of B．in need of C．during D．in time of

A．easy B．difficult C．necessary D．important

A．present B．past C．usual D．ordinary

A．used B．did C．tried D．managed

A．And B．Though C．Since D．But

A．which B．that C．to which D．where

A．well B．rather C．only D．just

A．questions B．situation C．problem D．thing

A．dogs B．soldiers C．planes D．hawks

A．enemies B．postmen C．balloons D．bullets

A．action B．part C．ball D．game

A．trained B．taught C．bought D．fed

A．killed B．sold C．honoured D．sent

A．the enemy B．hunger C．anger D．war

A．for B．to C．in D．through

A．landed B．found out C．set out D．set about

A．renewed B．arrived C．lost D．missing

A．Why B．How C．When D．Where

A．the head B．a body C．the foot D．a wing