Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

The children _______ by social networks are likely to suffer from depression and other health  problems.

Which of the following can be the best title for the passage?

Online shopping is more ______ nowadays, as customers can ask questions and get responses from sellers quickly,

The cost of ______ an advert on the Internet depends on the number of views it can get.

Residents are complaining about the huge ______, which is sO bright that it keeps them awake at night.

Social media is very popular among young adults. ______ contrast, many old people dislike using websites and mobile devices.

In order to prevent endangered species from going extinct, it is crucial to protect their natural habitats.