英汉互译。
老师经常鼓励我们努力学习.
The teacher often _______ us_______ work hard.
他已经读过这本书了.
He ________ ________this book.
在大城市找到停车场很不容易.
It‘s not easy to find a _____ ________ in a big city.
他们需要另外4个男孩来搬书架.
They  need ________ __________ boys to carry the the shelf.
他说他将来要当一名科学家.
He says that he ______ ________ a scientist in the future.