I ________ that the earth moves around the sun. A. often doubt B. never doubt C. sometimes doubt
---His brother John began to study French last year. And now he is good at it. He is so talented.---_______ He always learns things quickly.
We aren’t sure of the weather. We _______ sightseeing unless it_________ tomorrow.
Jim, _______do you know about table manners all over the world?
The old lady is so weak. She________by her relatives.
Behind the department store there used to ______ much waste, _______?