10.--Last week Roger Federer decided it was time to retire(退休). --Really?He is such a famous tennis star.He___________his dream and went for it all the time.( )
30.Sydney is a young city.Its history goes back just over 200 years.But in Australia,it is the oldest city.The capital of Australia——Canberra lies in the southwest of it.There are 4,284 thousand people in total in Sydney.It is the most populous(人口稠密的) city of Australia.Many people think that Sydney is one of the most fascinating cities in the world.It has many tall and modern buildings.Among them,Center Point Tower is the tallest.Standing on the 305-meter tower,you will have a great view of the city.Sydney is famous for its deep harbor(港口).The harbor has many bays (灣) and beautiful surf beaches.People living in Sydney seem to have an easy life style.The sky there is blue and the air is fresh.When they are not working,they love to have a good time at the beach,swimming and sailing(航行).