At the root of volunteering is the idea ________ one person may have the ability to offer services that can help other people.
—What about the student in your class, Mr. Wang? —The doctor said that sleep caused him poor memory and poor concentration.
Before driving into the city, you are required to get your car ____.
To avoid on how to use the word, you’d better refer to a dictionary.
Some insects________the colour of their surroundings to protect themselves.
There is a shortage of teachers in Western China, and it will fall on the 80s and 90s generations to this responsibility.