Rewrite the sentences: If you had not called him, he would not have come

Rewrite the sentences, beginning with the suggested words.
1. If you had not called him, he would not have come.
=> Unless
2. It is believed that the men died in the expendition.
=> The men
3. Margaret stayed home because her mother was sick.
=> Because of
4. His friends were so late, so they missed the train.
=> If
5. She didn't eat much though she was hungry.
=> In spite of
6. I am not good at English.
=> I wish
7. The plane couldn't take off because of the bad weather.
=> Because
8. People believe that 13 is an unlucky number.
=> 13
9. He couldn't solve the problem though he is good at maths.
=>Despite
10. I couldn't do the test because itit was difficult.
=> Because of
11. Ann didn't go to the circus with Betty because of having a bad cold .
=> Because