新概念第二册第四课，请帮我找错

Lesson 4 An exciting trip 激动人心的旅行
I have just received a letter from my brother, Tim. He is in Australia. He has been there for six months. Tim is an engineer. He is working for a big firm and he has already visited a great number of different places in Australia. He has just bought an Australian car and has gone to Alice Springs, a small town in the centre of Australia. He will soon visit Darwin. From there, he will fly to Perth. My brother has never been abroad before, so he is finding this trip very exciting.

应该加强练习：
four, bought, small, trip. 句中停顿有些长。