Tom was Mary’s brother! ________ he reminded me so much of Mary.
I would have come earlier, but I _____ that you were waiting for me.
Had I known about this computer program, a huge amount of time and energy .
_______the thick clouds, you would find the kite in the sky easily.
Experts say ________ to sunlight for too much time will do harm to one’s skin.
—What about the student in your class, Mr. Wang? —The doctor said that sleep caused him poor memory and poor concentration.