While being shy is normal, it is when the shyness interferes with an individual’s daily communication with others ________ it becomes a disorder.
_____________he referred to in his article was unknown to the readers.
______________breaks the law should be punished.
The government has to close those small factories to prevent the water of the river ______.
—Will you go swimming with me this weekend? —______.
21.Bob got seriously injured in the traffic accident, but luckily, the doctor came __________to save his life.