The40-somethings found themselves in an embarrassing situation _____ rapid changesin all aspects of society.

The teacher always reminds us, “On no condition_____ you are a Chinese.”

We have many summer camps for your holidays. You can choose ____ based on your own interest.

Who is the woman_______ orange over there— Oh, she is my mother.

Every hour and every minute ______precious to us because only six months are left for us to prepare for the college entrance examinations.