How unhappy your roommate looks!—Yes, but he’s not willing to tell me what it is ________ is troubling him.

Every pupil has his own potential so it is not proper to _____them ____ two kinds.

I’d like you to tell me something about Shennojia.I’m sorry，but neither Jack nor I______ there.

If you happen to know the answer, please raise your hand.

You look so cool in the new dress today. —_________.