Answer:
Explanation:
One possible answer is:
Although traveling by plane is expensive, it’s the fastest means of transportation.
Here, the conjunction introduces a contrast between the two clauses, showing a trade-off between cost and speed. Another possible answer is:
Because traveling by plane is expensive, it’s the fastest means of transportation.
Here, the conjunction introduces a cause-and-effect relationship between the two clauses, showing that the high-cost results from the high speed.