一、选择合适的介词，将句子补充完整。

1. Please chat me on the Internet.
2. I'm writing a letter my grandparents.
3. My mother is interested Xinjiang.
4. They are talking a new friend.
5. How old is the student Australia?

with to in about from

1. "chat with sb." 是固定搭配，意为“和某人聊天”，所以填with。
2. "write a letter to sb." 表示“给某人写信”，填to。
3. "be interested in..." 是固定短语，“对……感兴趣”，填in。
4. "talk about sth./sb." 意为“谈论某事/某人”，此处指谈论新朋友，填about。
5. "from Australia" 表示“来自澳大利亚”，填from。

二、用所给单词的适当形式填空。
1. Look! I (learn) English with Chen Jie.
2. Does he (live) in Ningbo?
3. What are Sarah's (hobby)?
4. We all like (do) word puzzles and going (hike).

1. am learning
2. live
3. hobbies
4. doing; hiking

1. 根据“Look!”可知，该句时态为现在进行时，其结构为“be动词+动词的现在分词”，主语是I，be动词用am，learn的现在分词是learning。
2. 一般疑问句，句中有助动词Does，后面的动词要用原形live。
3. 根据“are”可知，主语是复数，hobby的复数形式是hobbies。
4. “like doing sth.”表示喜欢做某事，do的动名词形式是doing；“go hiking”是固定短语，意为去远足。

三、将下列句子排列成一段通顺的对话。
()What's his hobby?
()Amazing! I know you like going hiking.
()Do you have a pen pal?
()He likes going hiking.
()Yes，his name is John.
()Yes，we have the same hobby.

3;5;1;4;2;6

文化知识拓展
Australia is one of the greatest islands in the world. It's in the south of the earth. Canberra is the capital of Australia. Canberra means "a place for friends to get together". Sydney is the oldest and largest city in Australia. It is famous for its deep harbor(港口). People there love to have a good time at the beach.
—What are most Australians' hobbies?
—Maybe

going to the beach

根据文中“People there love to have a good time at the beach.”可知，澳大利亚人喜欢在海滩玩乐，推测其爱好与海滩相关，“going to the beach”符合题意。