Question 17: The correct order is A. c-a-b, where:

• c talks about the importance of English for employers.
• a explains that English is an international means of communication.
• b provides an example of the advantage of speaking English for getting jobs.

Question 18: The best conclusion is A. Therefore, it's very useful to learn and use English.

Question 19: The correct preposition is B. of, as it connects the reduction with the impact on intelligence.

Question 20:

• For (20): The correct relative pronoun is A. which, referring to the tests.
• For (21): The correct word is C. whose, showing possession (people of certain ages).

Question 22: The correct word is B. areas, referring to locations affected by pollution.

Question 23: The most fitting word is C. shortcut, meaning there is no quick solution to the issue.

Question 24: The appropriate transition is A. Therefore, signaling the conclusion or result of the prior statements.

Question 25: The best way to rephrase is C. Why don't we drink some warm water after eating spicy food?

Question 26: The best paraphrase is C. She looked very graceful in spite of she was at the age of forty.