If you feel ______,you should listen to some light music to relax yourself.

The girl _______ red is my sister. [ ]

While he was investigating ways to improve the telescope, Newton made ________ discovery which completely changed ________ man’s understanding of color.

Though Lei Feng ________ for fifty years, we are still learning from his spirit.

Mr. Green didn’t understand ________ made his daughter so absent-minded this morning.