1.  Knowing(know)basic first-aid techniques will help you respond quickly to emergencies.  

2. Shortly after suffering from a massive earthquake and being reduced ( reduce ) to ruins,  the city took on a new look.  

3. It’s no use complaining(complain) without taking action.

4. Lydia doesn’t feel like studying(study) abroad. Her parents are old.

5. We found it no good making(make) fun of others.

6. Learning (learn)new words is very useful to me.

7. We have to prevent the air from being polluted(pollute).  

8. He remained standing(stand) beside the table.

9. The flowers need watering/to be watered(water).  

10. In some parts of London,  missing a bus means waiting(wait) for another hour.