---Why does the boy bring a chair here?---Because the bookshelf(书架) is half a metre __________ his head. He has to stand on it to get the books on it.
---Could you tell me ________? ---By searching the Internet.
My pen pal from America is coming to visit me. I’m thinking about ______.
I wonder ______ you would like to go hiking with us this weekend.
Could you tell me ?
— Kitty, do you know ______? — Sure, about forty minutes.