37. She sold her car last year. She had driven it for over twenty years. (which)
⇒ The car which had been driven for over twenty years was sold last year.
38. You sent me a present. Thank you very much for it. (sending)
⇒ Thank you very much for sending me a present.
39. He worked out the answer quickly. It was clever of him. (so)
⇒ He was so clever that he worked out the answer quickly.
40. Contacting her at work is usually quite easy. She is very busy. (despite)
⇒ Despite the fact that she is very busy, contacting her at work is usually quite easy.
