Evidence of a powerful volcano, which erupted under the ice sheet of West Antarctica around 325BC and might still be active now, __________ so far by British scientists.

Mr. White is glad to see her daughter go to school by bike .

________ those who were not listening the first time, I will repeat the question.[ ]

It was along the Mississippi River ________ Mark Twain spent much of his childhood.

Monday is the ______ of the week.