The Great Green Wall can stop the wind sand to the rich land in the south of China.
Do you know if Dr White will come for dinner this evening? No, but I think he ______ if he ______busy.
______ adults began to learn English in this small town.
Mr. Bean enjoys ___________ jokes and always makes us happy.
does it take you to watch TV? —About forty minutes.
When is your father going to Hong Kong? —He is going there July 28th.