_________ it takes many years to gain the skills of an expert.
_______ the necklace borrowed from her friends made her_____ completely.
John, look at the time. ____ you play the piano at such a late hour?
---In the countryside you can enjoy fresh air, blue sky and quiet surroundings. ---_______ more and more retired people are escaping from the crowded city.
The police ______ the stolen jewellery and returned it to the owner.
____the problem of land erosion(侵蚀) getting more serious, the government is searching for a way to deal with it.