根据短文内容及首字母提示，填写所缺单词。

     Nylon (尼龙) 1. w______ invented in the early 1930s 2. b______ an American chemist, Julian Hill.

Nylon was introduced to the world. It was cheap and strong and immediately 3. b________ successful,

especially in the making of women's stockings.

     During the Second World War (战争), the best present for many women was a pair of nylon

stockings, but more importantly, nylon was 4. u______ to make parachutes (降落伞) and tyres.

     Today, nylon is found in many things: carpets, ropes, seatbelts, computer, furniture and so on.

It has 5. p______ an important role in our lives for over 50 years.

1.______ 2._____ 3.______ 4.______ 5.______

在小盒子里有9个红球，4个绿球，2个黄球．如果随意摸出一个，摸到______的可能性最大，摸到______的可能性最小．