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1. Yesterday was a public day, (since) we didn't have to go to work.
2. We didn't want to wake anybody up, (as) we came in very quietly.
3. We didn't know what time it was, (because) none of us had a watch.
4. It was a nice day, (so) we went for a walk by the sea.
5. The door was open, (so) I walked in.
6. You paid for the theater tickets, (so) please let me pay for our dinner.
7. Oil is an irreplaceable natural resource, (so) we must do whatever we can to conserve it.
8. We didn't see Lisa for a long time, (because) we didn't recognize her.
9. Lillian was late for work, (because) she missed the bus.
10. Sonia was tired, (because) she'd been working very hard.
11. Eve had an attractive personality, (so) she was very popular.
12. Mother had burnt the dinner, (so) it explains everything very clearly.
13. It's a really useful book, (because) the teacher decided to give it again.
14. All the students had done poorly on the test, (so) the teacher decided to give it again.

Chú thích: Mỗi câu phù hợp với phần sau được ghép lại sao cho hợp lý, với các liên từ phù hợp như "since", "because", "as", và "so" để thể hiện mối quan hệ nguyên nhân, điều kiện và kết quả giữa các phần khác nhau trong câu.