The math problem is too difficult ,I can’t__________ .

There is still a copy of the book in the library. Will you go and borrow ?—No, I’d rather buy in the bookstore.

Excuse me, Mr. He, are you free? Lin Tao and I want to tell you _____.–Sure.

Jake ______ his friends is waiting ______ their teacher. [ ]

Mum, why don’t you have the robot ________ housework for you?— Oh, it caught a virus, I should have it _________ at once.