—Did you find your lost key?—No, but I think ________ must have picked it up.
Although they feel tired, _________they still go on working.
---You look very healthy. ________do you exercise?-----I exercise three times a week.
---.His mother wants him ________at home all day.-----Really? That’s terrible.
All my friends came to my birthday party. That _______me very happy.
---__________was your vacation?---Very good.