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

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.

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