—Did you find your lost key?—No, but I think ________ must have picked it up.
It is important for us ________English well.
Yesterday the teacher told us that the earth ________around the sun.
________ the alien was in the museum, I called the TV station.
Tim was so tired this morning. It was difficult to _________ of bed.
He told me that he ________ the Disney World the next day.