(2013·浙江，11)Half of ________ surveyed in 16 countries say they go first to their closest friend to share their deepest wishes and darkest fears.

On the annual International Volunteers Day, the world ______ the work of millions of people who give their time to help others．

 —Jack can't concentrate on his lessons recently.—Yes, that might ____ why he did so badly in the last test.

 ---I am taking my driving test tomorrow! ---__________!

Don’t mention that at the beginning of the story, or it may _____ the shocking ending.