There are many online libraries where you can read books for ________, such as the national Online libraries Library of China and Shanghai Library. （免费的）
The app about how to learn Chinese is very popular ________ the foreigners.（在……当中）
Jumping the rope is a kind of full-body exercise and it is great for the ________（大脑）.
No country is safe ________ all countries are safe. （除非）
—Could you tell me the way to the nearest cinema?
—Well, I’m going there. Just ________ me. （跟随）