79.! That step is not safe!

46.We are living in an agemany things are done by computer.

45.The boyI met at the party is my brother * s best friend.

44.Words are windowsyou look into the past.

43.I have a friendmother is a doctor.

42. is known to all, English is one of the most widely used languages in internationalcommunication.

41.The only thingbothered Chris was that his boss never replied to his email.

40.She studied hard at school when she was young, contributed to her success in later life.

39.I don＇t know the reasonMichael didn＇t come yesterday.

38.Mr. Zhang, cameto see me yesterday,is an old friend ofmyfather *s.

37.T m going to spend the winter vacation in Shanghai, I have relatives.