Here are the suggested answers for the blanks in the passage:
Question 25: A. Result
Correct answer: A. result (The context suggests that these factors contributed to the traffic issue, making "result" the better choice.)
Question 26:B. fee
Correct answer: B. fee (A "congestion charge" is typically referred to as a fee paid for entering certain areas, rather than a fine.)
Question 27: B. in
Correct answer: B. in (The correct preposition to indicate the year is "in" 2003.)
Question 28: B. but
Correct answer: B. but (The sentence presents a contrast, indicating that despite initial opposition, support grew.)
Question 29: A. that
Correct answer: A. that(The word "that" is used to connect the clauses in this context, indicating the result of the scheme being profitable.)
So the completed passage would look like this:
Many large cities around the world have struggled to keep up with the increase in traffic in recent times. Densely populated areas, growing car ownership, as well as narrow roads brought for much lower volumes of traffic all result to this. In 1975, Singapore decided to introduce a congestion charge - a fee paid by drivers entering the most traffic-heavy zones of the city. London introduced a congestion charge in 2003. Public opinion was initially opposed to the idea, but people soon became more supportive of the scheme. Despite this, its first decade brought mixed success, and the number of cars in the city fell by only 10%. However, the scheme proved massively profitable, that allowed the city council to invest in other measures aimed at improving traffic conditions in London. These included cycle lanes, pedestrianized areas and better road surfaces.