___do you think of the song “trouble is friend”— Wonderful. It’s worth ________.

er I met her，________ was fairly often, she greeted me with a sweet smile.

While there are some differences in the educational systems in many countries in the world，education is ________.[ ]

Henry told me that he _____ to return you the book the next day.—Yes. He _____ it to me yesterday.

Finding information is not a big deal today..— Well, the ______is how we can tell whether the information is useful or not.