阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写1个适当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。

Amsterdam has become very popular with cyclists because of the convenience for bicycles. In the 1960s, a group of cycling fans came up with an idea 【小题1】(make) Amsterdam the city of bikes. People had hundreds of bicycles 【小题2】(paint) white and anyone was allowed to take them. They were hopeful that this would save energy, reduce pollution and provide free public transport. However, thieves stole them all. In 1999, the “white bikes” returned with a computer 【小题3】(track) system to record their every move. It worked this time. Nowadays people can enjoy clean air and easy transport in central Amsterdam and bike-sharing is gaining favors across the globe. In China, many people are devoting 【小题4】(them) to solving problems so that people can enjoy the benefits of shared-bikes.