用所给单词把两个句子合并成一个句子
1. Tom arrived at his school. He started his lessons.(after)
___________________________________________.
2. It's December. It's summer in Australia. (although)
___________________________________________.
3. The boy has a bad temper. We'd better not talk to him. (and)
___________________________________________.
4. She was laughing all the time. Everyone thought it was funny. (that)
___________________________________________.
5. Summer is hot here. Winter
is cold. (but)
___________________________________________.
