Rewrite the sentences

V. Rewrite the sentences.
1. The visitor spoke quickly, so I couldn't understand what he said.
=> I couldn't..........................................
2. They can't come on Saturday because they are busy.
=> They are busy..................................
3. She got up late but she was not late for school.
=> Although...........................................
4. The trip to Chicago is not so expensive as we think.
=> The trip to Chicago is.....................
6. My English book are on the table.
=> The English books on......................