Choose if or unless

1. [If|Unless] she calls, I'll tell her the news.
2. [If|Unless]Dave studies harder, he won't pass his driving test.
3. [If|Unless]I finish early today, I may go to the cinema.
4. [If|Unless]you stop eating fast food, you won't lose any weight.
5. [If|Unless]you have a headache, you can take an aspirin.
6. [If|Unless]you get a lift from Darren, you will miss the concert.
7. [If|Unless]Chelsea plays better, Manchester United will win the Premier League.
8. [If|Unless]I see Tim, I'll give him your phone number.