社会总产品是指一个国家在一定时期内(通常为一年),由各个生产部门的劳动者生产的( )
The latest data put forward by the states suggested that the business ___ improving.
He is _______ a good teacher. He is also his students' good friend.
---Are there any English story-books for us students in the library? ---There are only a few, _______________.
Without proper lessons, you could ____ a lot of bad habits when playing the piano.
We thought of selling this old furniture;but we’ve decided to ____it. It might be valuable.