is very difficult for us to learn English well because is a quite difficult language.
―Look at the lady there. ______ it be Mrs. Green? ―No, it _______ be her. She left for London this morning.
We all want to try something new, but finding the ________ to start is always the hardest part.
There are only ________ new words in the book, but I know _______ of them.
The world paused to remember a cultural giant _______ April 17 after Nobel Prize-winning writer Gabriel Garcia Marquez died _______ the age of 87.
―Excuse me, Jim. Do you have any books about Chinese history? ―Yes. ______ book above the shelf is _______ useful one.