改写句子 按括号中的要求完成句子，每个空格填一个单词。
I used to be afraid of the dark.（改为否定句)
I                       to be afraid of the dark.
Tea plants are planted on the sides of mountains.（就句子划线部分提问）
_________  _________tea plants planted?
“What do you sell online?” I asked the young boy. （改写句子，句意不变)
I ask ed the young boy             he            online.
Nowadays, we can communicate with friends anytime and anywhere more easily and cheaply by using the WeChat（微信）.（改写句子，句意不变)
Nowadays, it is more            for us to communicate with friends with the            of the Wechat.
When we see people dropping rubbish about, we should stop them politely. （改写句子，句意不变)
People should be stopped politely when they _________  _________ dropping rubbish about.