There is ________ in population that a food shortage is caused.
Soon , Mary _____ the shock and became calm again.
The children were surprised by the sudden _____ of their teacher.
---Mike, you know, I have read the book twice! ---______? I have read it so many times that I can recite it now.
—I hear you have an experience in the Royal Air Force. Is that ture? —Yes. I ______ in the Royal Air Force for six years. A. served B had served C joined D have joined
Life is tough in the city. In order to lose their ______, some people drink alcohol.