In my point of view, the question is not _____ the world is going to have a new economic crisis, but when.

Listen! How the music sounds!

The terrible disease, ______ already kills about one million people each year, has grown resistant ______ standard medicine..

－Why can’t Simon see the words on the blackboard－Because two tall boys are sitting ______ him.

This song reminds me ______an experience I once had in the countryside.