CITIES GOING GREEN

Câu hỏi: 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 34 to 38.
As more and more people concentrate in cities, planners are looking for ways to transform cities into better living spaces, (34) ________ can be done by improving existing infrastructure while also creating more public (35) ________ that are both beautiful and green. This can be hard to accomplish, especially in cities with a haphazard fashion. Some cities have been created with the idea of a green city as the goal.
One such city, Masdar City in the United Arab Emirates, aims to become a model for (36) ________ cities to follow. It is being known as a truly green city that relies strictly on renewable sources such as solar energy to provide all of its energy needs. (37) ________ , it will be a zero waste city in which everything that is used can be recycled. Whether it will truly (38) ________ its goal remains to be seen, but it will also act as an experiment for environmentally friendly areas to be tested.
The word or phrase which best fits the gap (37) is...
A. Therefore
B. In addition
C. although
D. However