The practice of hanging clothes across the street is a common ______ in many parts of the city.

Health problems are closely connected with bad eating habits and a _______ of exercise.

One of the advantages of living on the top floor is that you can have a good _____ of the city．

Due to the widespread ________ of this medical technology, more diseases can be discovered and treated at an early stage.

 The need for an operation，especially an immediate operation， almost always comes as a ______ to the patient and his family.