"Tommy, run! Be quick! The house is on fire!" the mother shouted, with clearly in her voice.
According a recent report, there are _________ to be 1.35 billion people in China in 2017.
In the old days, some wealthy people killed animals just for the ______ of it.
Xiao Li was about to cheat in the exam ________ the teacher came up, smiling to him.
You can find me easily, for there is only one house _______ roof is flat.
I shall never forget the days ______ I stayed in Africa, ________ has brought me a lot of advantages.