1. I’m on a diet ........... I have stopped eating chocolate.

because

so

as

since

2. ........... ill, he went to the doctor

Being

because

because of

according to

3. The match was cancelled ........... it rained.

because of

because

due to

so

4. The jet was grounded .............. engine trouble.

due to

because

hence

therefore

5. He was punished ............ he was careless

because of

since

hence

therefore

6. I stayed at home ........... it was raining.

due to

because

hence

so