Jawaban:

1. Due to the awful weather we were completely exhausted.

2. Because my car accident I was late at the meeting.

3. The man was detained because of his suspicious behavior.

4. The jet was grounded because it had engine trouble.

5. The jet was grounded because of engine trouble

6. The match was cancelled because it rained.

7. He succeeded because he worked hard.

8. The man was detained because his behavior was suspicious.

9. All the flights had been cancelled because of the volcano eruption.

10. John had been saved because of one little boy's bravery.

CMIIW

Penjelasan:

penggunaan Because dalam kalimat tersebut diikuti oleh klausa "her mother was sick." Sedangkan because of merupakan preposisi atau kata depan. Sehingga because of biasanya diikuti oleh noun (kata benda) atau pronoun.

sedangkan penggunaan Due to hampir sama dengan penggunaan because of karena due to digunakan untuk menyatakan sebab akibat juga. 

CMIIW