Zhijin Cave is known as the most beautiful underground         (宫殿) in the world．
Susan usually has some pieces of b        and a bottle of milk for breakfast．
In English the first name is the g        name．
Spring is the best time for p         trees．
— Excuse me．Are you f         now?
— Sorry，I’m very busy．
It’s ten          (分钟) walk．
He         (使用) a lift to go up and down every day．
Food must be           (保存) in cool places in summer．
We often listen to our teacher            (认真) in class．
With the d        of computer science，more and more work will be done by computer．