The house is big enough for them to live in.（改为否定句)
The house ____________ ____________ big enough for them to live in.
The new sunglasses cost 29.9 dollars. （就句子画线部分提问）
____________ ____________ do the new sunglasses cost?
"Where were you born?" the teacher asked me.（改写句子，句意不变)
The teacher asked me____________ I ____________born.
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.
Mr. Li pointed out the tour guide's mistakes and told him it was rude to treat the tourists that way.（改写句子，句意不变)
The tour guide ____________ ____________ by Mr. Li because of his bad behavior towards the tourists.源:学§