根据下列句子及所给首字母, 写出各单词的正确、完全形式（每空限填一词）。
（1）、Many local people like Hai Di Lao Hot Pot for its delicious food and excellent s.
（2）、Hangzhou now is well-known as the h city for G20.
（3）、It's necessary to take actions to fight a more and more serious pollution.
（4）、Never try to cross the road u the traffic lights turn green.
