Choose the correct option in braciets to complete each sentence.
1. If we (protect/ protected) our forests, we will help our planet.
2. I'm not sure what to do next weekend. I (might/ have to) go to the cinema.
3. I (will/ might) fly to Ho Chi Minh City next Saturday, but I'm not sure yet.
4. If we continue to pollute the air, we will (have/ having) breathing problems.
5. It's very likely that they (will/ might) be here by 10.30 p.m. tomorrow.