“___________ do you spend on your homework every day, boys” “About two hours.”

The ad says that one can lose 10 pounds in a week if using the products,but I’m ________ about that. [ ]

Professor Zhang gave all the textbooks to all the pupils, except ________ who had already taken them.

Hello! Are you Mr Wang — _______

下列各句中，没有语病、句意明确的一项是（ ）