I worked as hard as I could _______ for the final exam.

—I regret ________ you that your application has not been successful.—Not successful? I performed pretty well in my interview!

 ____ volcanoes now for many years, I am still amazed at their beauty as well as their potential to cause great damage.

My sister，an inexperienced rider，was found sitting on the bicycle _________ to balance it．

—Was the judge ______ with the result?—I don’t think so. But perhaps no judge is easy _______.