257.When one has good health, ________ should feel fortunate.

46.He's__________as a "bellyacher"-----he's always complaining about something.

45.If you have really been studying English for so long, it's about time you__________able to write letters in English.

44.He__________unwisely, but he was at least trying to do something helpful.

43.I've never been to Lhasa. but that's the city__________.

42.There ought to be less anxiety over the perceived risk of mountain climbing than__________ in the public mind today.

41.It is not so much the language__________the cultural background that makes the book difficult to understand.

40.Fat cannot change into muscle__________muscle changes into fat.

39.Professor Johnson is said__________some significant advance in his research in the past year.

38.The three men tried many times to sneak across the border into the neighbouring country,__________by the police each time.

37.After__________seemed an endless wait, it was her turn to enter the personnel manager's office.