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If you go into the forest with friends，stay with them．_______you don’t，you may get lost．If you really get lost，this is what you________do：sit down and stay where you are．Don’t try to________your friends—let them find you by staying in one place．
There is_______way to help your friends or other nearby people to find you．Give them a signal（信号）by shouting or whistling（吹口哨）three times．Stop．Then shout or whistle________times again．Any signal given three times is a call for________．
Keep up the shouting or whistling_______three times together．When people_______you，they will know that you are not just making noise for________．They will let you know that they have heard your signal．They will give two shouts，two whistles or two gun shots（枪声）．When someone gives a signal．it is________to a call for help．

A．When B．If C．Whether D．While

A．may B．would C．will D．should

A．call B．see C．find D．hear

A．another B．other C．the other D．others

A．two B．three C．four D．five

A．help B．answer C．food D．money

A．always B．usually C．sometimes D．never

A．see B．call C．hear D．answer

A．help B．fun C．stay D．noise

A．a question B．an answer C．a signal D．a cry