According to the air traffic rules, you should ________ off your mobile phone beforeboarding.

_____ is your jacket— It’s purple.

Before going his oral English.

Do you think it’s a good idea to make friends with your students— _____, I do. I think it’s a great idea.

Don’t look down upon Bob. He has his own advantages. —-Oh, yes. ______ others are weak, he is strong.