--The sixteen-year-old student is very good at music. He himself has written some good music.--Really? What a(n) _____________ boy!
--How many students are there in the classroom? --___________.
Sandy spent too much time _________ computer games.
Please _____ who broke the window.
I enjoy learning English, it takes me a lot of time.
There used a tree in front of the house, but now it is cut down.