________is well known to everyone，I should say，is that a man becomes learned by asking questions

16Large quantities ofinformafion，as well as methnely help，_______since the organization was built

fell behind in my studies because I went through about four years of being _____ online games.

Across all media，people are debating about________we need to keep track of every school bus on China’s road

f us manage our physical health better than ouremotional health, ______ problems to cause real harm.