2.The student arrived late because there was a traffic jam.

3.We decided to leave early because the party was boring.

4.It was a public holiday because all the shops are shut

5.I lost my jod because I was ill

2. The student arrived late because there was a traffic jam

    The student arrived late because of a traffic jam

3. We decided to leave early because the party was boring

    We decided to leave early because of the boring party

4. All the shop were shut because it was a public holiday

    All the shop were shut because of a public holiday

5. I lost my job because I was ill 

    I lost my job because of my illness