—I heard they went skiing in the mountains last winter.—It ______ true because there was little snow there.
Tsinghua University, ________in 1911, is home to a great number of outstanding figures.
Attention! Before the plane________,passengers will have thirty minutes to board.
In________,people in that village were very poor.
—Will you give this bag to Mr.Li? —Sorry,I can't. He________.
Usually I don't allow________in my office,but yesterday I allowed him________ here.