Ex3,
1. I didn 't feel well so I stayed at home
2. He liked her because she was happy
3. I like Spain but wanted to go home
4. She likes swimming and jogging .
5. We were late because there was an accident
Ex4:
1. I lost my money so I couldn't buy anything
2. She likes you a lot because she thinks you are very intelligent
3. I looked for the key but I couldn't find it
4. My friends were ill and had to stay at home
5. The film starts at ten so we couldn't be home by eleven
6. I got good marks on the test because I studied very hard.
Ex5 :
1. because
2. although
3. and
4. but
5. so
Ex6 :
1. a
2. b
3. d
4. e
5. c