Complete the sentences using the words in brackets.
1. If I catch the bus at three _____ (I / arrive / in time for the demonstration)
2. If we dont do something about global warming ____ (the world / have / big problems in the future)
3. You wont pass your test ____ (you / not study)
4. If we didnt protect the birds ____ (they / become/ endangered)
5. Would you buy organic food ____ (it / be / cheaper)
6. You would use less electricity ____ (you / use / low-energy bulbs)