阅读下面材料, 在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
Dear Dad and Mona,
    We have been in Australia for three days．We're having a good time here．Australia is the sixth____(large)country in the world．There is so much to see____it is impossible for  me to tell you everything．We are now living in a hotel．It is located in the centre of Sydney, and our room has a wonderful view of the city．There are ____ (much)big trees and beautiful flowers all over the city and it is great pleasure staying here．____ most enjoyable thing is to watch koalas sleeping in the tree．
We____(visit)many places of interest around Sydney yesterday and the day before yesterday．I'd like to spend more time here, ____Linda and May can't wait to see the coral reefs(珊瑚礁)in Cairns, SO we are going to ____ (fly)there tomorrow．It is said that words cannot describe the beauty of the colorful corals．Now we are busy ____(prepare)for the next trip to Cairns SO that we will not hurry when we leave．We can enjoy ____ (us)in Cairns this time tomorrow．I'm looking forward ____visiting the attractions there!
Lots of love
Sam