A good listener takes part in the conversation，________ ideas and raising questions to keep the talk flowing.                                                   (2013·浙江，12)

—We didn’t find the Blacks ________ the lecture.
—No one had told them about ________ a lecture the following day.

His first book ________ next month is based on a true story.

In order to improve English，________.

Taking this medicine，if________，will of course do good to his health.

________such a heavy loss，the businessman didn’t have the courage to go on.

I’ve worked with children before，so I knew what ________ in my new job.

Generally speaking，prices of daily goods ________ through the Internet are lower than store prices.

________tomorrow’s lessons，I have no time to play with you.