完成句子。
1. We often begin our speech with "_____ (女士们) and gentlemen!".
2. The Smiths just came back from Qingdao. They had a lot of fun _____ (旅行) there.
3. He does everything well because he is always _____ (严肃的,认真的) about what he does.
4. He put down the school bag and _____ (扫除) the floor of the room.
5. Can I use your dictionary? _____ (我的) is at home.
6. They usually buy lots of books _____ (虽然) they are not rich.
