41.   The operation was only partially successful.

42.   The operations can be quite involved, requiring many procedures.

43.   A full-scale security operation is now under way.

44.   We will have to wait a week or so before we know whether the operation is a success.

45.   An air force spokesman said the rescue operation was a race against time.

46.   The waste disposal industry is finding it difficult to convince the public that its operations are safe.

47.   The military operation was the first step in a plan to crush the uprising.

48.   National and international relief efforts must coordinate if the operation is to be successful.

49.   The operation was successful and the patient is doing well, thank you.

50.   While John Gilbert was in hospital, he asked his doctor to tell him whether his operation had been successful, but the doctor refused to do so.