阅读下面短文，在空白处填入1个恰当单词或括号内单词的正确形式。Floods are common and {#blank#}1{#/blank#}(frequent) destructive natural events that annually affect around 250 million people worldwide. Though the causes of floods --usually heavy rainfall or melting snow-- are {#blank#}2{#/blank#}(avoidable), knowledge of the correct procedures before, during and after a flood can make a difference.
Before a flood occurs, we must work {#blank#}3{#/blank#}(reduce) the risk to people and their valuables. Firstly, you should prepare disaster supplies {#blank#}4{#/blank#} include a light source, sleeping bags, warm clothes, and most importantly, at least three days of food and drinking water. Secondly, you should bring the most important objects to the {#blank#}5{#/blank#}(up) levels of your house.
During a flood, it's important to leave {#blank#}6{#/blank#} you are immediately. The longer you stay, the more danger you'll be in. Be sure to move to higher ground. If you're already inside a building, move to the upper floor. Don't walk {#blank#}7{#/blank#}drive through the moving floodwater, since as little as 15 centimetres of moving water is enough to knock an adult down, and 60 centimetres can wash most cars away.
{#blank#}8{#/blank#} a flood, listen for official news reports to find out when it's safe to return to your home. As you return home, watch out for possible {#blank#}9{#/blank#}(danger). The flood may have damaged roads and power lines. Keep away from the floodwater, because it may {#blank#}10{#/blank#}(pollute) and unsafe to touch.
