25. She (move) …………………………..………. to Scotland some years ago.
26. I (just receive) …………………………………………. the letter from my aunt.
27.He (live)……………………………………. in that village since 2009.
28. Nylon (invent) ………….. in early 1930s by an American chemist, Julian Hill. Other scientists (work) ……….. with his invention and finally on 27 Octorber 1938, nylon (introduce)….………….. to the world .It was cheap and strong and immediately (become) …………….. successful, especial in making old ladies’ stockings. During the Second World War , it (use) …………….. to make parachutes and tyres.
Today, nylon (find) ……………….. in many things: carpets, ropes, seat bells, furniture, computers and event space parts for the human body. It ( play ) …….……….. an important part in our lives for over 50 years. Next year, about 2.6 million tons of nylon (manufacture) ……………