Complete each sentence with an appropriate expression from the box.

1. We always ask our guests to remove their shoes ... avoid damaging the carpets.

2. The student needed some information on extinct animals, ... he went online to find it.

3. Always keep your receipt ... make sure you can get a refund if the product is faulty.

4. Take an umbrella ... a sudden rain.

5. Ann has been learning Italian perhaps ... studying in Italy.

6. There won’t be a concert today ... the illness of the singer.

7. The rise in population ... better living conditions.

8. It has been raining heavily for several days, ... farmers may lose their harvest.

9. The strong storm and fallen trees caused traffic jams, ... many people missed their flights.