I am really scared to know the scores of the test! —________，why did you come here to see our teacher?

However, at times this balance in nature is disturbed by human activities, _______ a number of possibly unforeseen effects.

Wind power is an ancient source of energy ________ wemay return in the near future

I can’t remember when exactly the Robinsons leftcity.I only remember it was Monday.

Facts showed that only when they united ______ the strong enemies.