Решите пожалуйста английский, срочно) 14 А упржнение

Which of these animals is the fastest?
Which of these languages is the the widest spoken?
Which of these rivers is the longest?
Which of these oceans is the biggest?
Which of these buildings is the oldest?
Which of these cars is the most expensive?
Which of these kind of learning is the most difficult for you?
Which of these countries is the warmest?
Which of these cities is the most populated?
Which of these climate is the healthiest?