Join the following pairs of sentences using because and because of

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EXERCISE 3.Join the following pairs of sentences using because and because of:
1. He didn't go to school. It was raining .
-> He didn't go to school because it was raining.
-> He didn't go to school because of the rain.
2. The student arrived late. There was a traffic jam.
3. We decided to leave early. The party was boring.
4. It was a public holiday. All the shops were shut.
5. I lost my job. I was ill.