It is important to have your eyes examined regularly to check for any sign of eye disease that may not have any ________.
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.
The people from the south enjoy the________in the north during the winter because they have never seen snow before.