How many people learn English as a second language?— ________, there are more than 375 million people[ ]

It’s raining heavily. You’ d better _______ yourraincoat.— All right.

Tony, are you listening to me ？——Sorry sir, I to understand what you said just now

Let’s go hiking ___________ staying at home, shallwe—A good idea.

Curious about the world around them, children___________ask their parents endless questions.