____ you change your mind,please let me know.
_____time goes by, my grandfather’s memory seems to get worse and worse.
Mr. Li lent me a book last week, _____I have learned a lot about earthquakes.
--- Have you moved into the new office building?---Not yet .It ______
Tourists were told _____their sunglass to protect their eyes from the strong sunlight
She opened the handbag but couldn’t find the money _____she was to buy dog food.