Ss have a good review of the key words, useful phrases and sentences.
Explain some usages of the key words and phrases.
1. signal / single / symbol / sign / sigh / scene / scenery / sight
White has always been a _______ of purity.
The policeman made a ________ to the driver to stop his car.
2. arise / happen / occur / come about / take place / break out
Great changes ____ in my hometown since I left.
A. have been taken place B. have taken place C. took place D. would take place
