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阅读下面的材料，在空白处填入一个适当的词，或填入括号内所给单词的正确形式（每空最多不超过三个单词）。

Nowadays we can see more and more electric bikes in the street. Electric bikes 1． (be) easy to ride. They run fast and make no 2． (pollute). They become very popular, 3． the electric bikes also cause more traffic accidents. So China plans 4． (make) new rule for the electric bike riders. If an electric bike is 5． (heavy) than 40 kilos and can go faster than 20 kilometers an hour, its rider must get a license. It means riders have to pass driving tests before they ride 6． (them) electric bikes on the road.

People have different ideas after 7． (hear) the plan. Some welcome the plan. A bus driver said happily, “8． a good plan! I think it will make the street much safer.” Some are not happy with the rules at all. One rider said 9． (sad), “I don’t want to get a license. That’s not convenient 10． me to get one.” Some don’t care about it. A young rider said calmly, “I prefer to use shared bikes which are popular in many big cities of China now. I hope they can come to Loudi earlier!”