Combine the following pairs of sentences, using "because"1. He was a careless driver. He had accidents too often.2. He looked happy. He passed the test.3. We wanted to see the wild animals. We went to the zoo.4. He failed the examination. He didn’t study hard enough.5. He has a bicycle. He doesn’t have to walk to school.6. He can’t go to work. He had a terrible accident.7. I can’t phone her. I don’t know her telephone number.8. I can’t give you this pen. I have only one.9. She needs some stamps. She is going to the post office.10. She has to take care of her grandmother. She can’t go to the party.