The fact has worried many scientists ________the earth is becoming warmer and warmer these years.
In our childhood, we were often ______ by Grandma to pay attention to our table manners.
Many lifestyle patterns do such _____ great harm to health that they actually speed up ____ weakening of the human body.
Stay awake! You should know that it ________ to sleep in class.
________ made the parents proud was________ their son had been admitted to a key university.
—I’m thinking of the test tomorrow. I’m afraid I can’t pass this time.—__________! I’m sure you’ll make it.