9 Join the sentences using because.
Mike couldn't get in. He lost his key.
Mike couldn't get in because he had lost his key.
Example:
1. Dan couldn't buy a new disk. He spent all his pocket money.
2. Tim had a sore throat. He ate four ice-creams.
3. Vicky felt very hungry. She didn't have breakfast.
4. Alex played computer games. His parents bought him a computer.
5. Lucy couldn't go out. She didn't do her homework.
6. Paul couldn't play the computer. He didn't turn it on.​