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#3.

2. Dilnaz enjoys working with children at the weekend.

3. She claims to have been volunteering all summer.

4. Air pollution tends to get worse every year.

5. He regrets having missed the neighbourhood clean-up day.

6. They appear to be planting trees in the park.

#4.

1. I avoid sitting up late hours.

2. I stopped smoking.

3. I must do morning exercises to keep fit.

4. I've always wanted to visit Baikal.

5. I'd love to visit Paris as well.

6. I enjoy helping my Mum.