keep fit

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 40 to 44.

Nowadays there are many good reasons for using bicycles _(40)_____ cars to travel in city centres. First of all, bicycles are both silent and clean, and easy to park. Secondly, using a bicycle also __(41)____ people fit. However, city centres must either have cycle lanes _____(42)___ be free of private cars completely. Some large cities, such as Amsterdam in (43) __________Netherlands, are already organized in this way. (44) _______ a combination of the use of bicycles with very cheap or free public transport solves the problem of traffic jams and makes the city centre a more pleasant place.