Understanding________cultural habits of another nation is_______ difficult thing.
Thank you for all your hard work last week. I don’t think we _____ it without you.
The boy ________ on the ground ________ to me that he ________ the book on the table.
You can hardly imagine the trouble we had _______ in touch with him again?
_______ houses were knocked down in the earthquake.
The news that an earthquake happened in Yushu ______ throughout the whole world quickly.