I. Complete the sentences with either because or because of.
- We delayed our trip ___________ the bad weather.
- Sue’s eyes were red ___________ she had been crying.
- My mother is always complaining ___________ the untidiness of my room.
- The water in most river is unsafe to drink ___________ it's polluted.
- The trees were bend over ___________ the wind.
- You can’t enter this secure area ___________ you don’t have an official permit.
- It’s unsafe to travel in that country ___________ the ongoing civil war.
- Several people in the crowd became ill and fainted ___________ the extreme heat.
- Mark didn’t go to work yesterday ___________ he didn’t feel well.
- We couldn’t get into the disco ___________ the enormous crowd.
II. Match the two halves of the sentence. Then write the full sentence, using the word in brackets. Add commas where necessary.
| A | B |
|---|---|
| 1. Yesterday was a public day | - she was very popular. (since) |
| 2. We didn’t want to wake anybody up | - we ate out. (as) |
| 3. We didn’t know what time it was | - it explains everything very clearly. (because) |
| 4. It was a nice day | - none of us had a watch. (because) |
| 5. The door was open | - the teacher decided to give it again. (since) |
| 6. You paid for the theater tickets | - she missed the bus. (because) |
| 7. Oil is an irreplaceable natural resource | - we went for a walk by the sea. (as) |
| 8. We didn’t see Lisa for a long time | - we didn’t recognize her. (because) |
| 9. Lilian was late for work | - we must do whatever we can to conserve it. (since) |
| 10. Sonia was tired | - we came in very quietly. (as) |
| 11. Eve had an attractive personality | - she felt weak. (because) |
| 12. Mother had burnt the dinner | - we didn’t have to go to work. (since) |
| 13. It’s a really useful book | - please let me pay for our dinner. (as) |
| 14. Ellie hadn’t fully recovered yet | - she’d been working very hard. (because) |
| 15. All the students had done poorly on the test | - I walked in. (since) |