Question VIII: 1. so 2. so 3. but 4. and 5. because
Question IX: 1. a: I lost my money so I couldn’t buy anything.
2. b: She likes you a lot because she thinks you are very intelligent.
3. e: I looked for the key but i just couldn’t find it.
4. c: My friends were ill and had to stay at home
5. f: The film starts at ten so we couldn’t be home by eleven.
6. d: I got good marks on the test because I studied very hard