Read the possible answers. Remember these answers are given as a reference. It doesn't mean that your answers are incorrect

1. If only there were more places on Earth untouched by human activity.
2. Mark wished his colleagues had shared the information they had collected before the beginning of the conference. He didn't know what to answer due to the lack of the necessary data.
3. A few decades ago the fish population in this river recovered when the factory stopped dumping toxic waste into it.
4. I wish my sister would tell me what she is not satisfied with instead of taking offence and keeping silent.
5. Kelly took offence at my words. We haven't spoken for several days, and I still don't know what caused our conflict.
6. As soon as people started recycling rubbish, the number of rubbish dumps has decreased.
7. I wish there were fewer landfills on the planet. We must stop littering the Earth.

• The sentences describing real actions: 3, 5, 6
• The sentences describing unreal actions: 1, 2, 4, 7
• Sentence 2 refers to the past.
• Sentences 1, 4 and 7 refer to the present or future.