When the teacher came into the classroom, all of us __________ the classroom.A. are cleaning B. were cleaning C. cleanedD are cleaned
—Don’t forget to write to me as soon as you _____ Brazil.—No problem.
Look! ______students are doing sports on the playground.
—Which do you like ____ , Chinese , Math or English?—English.
—What do you think of sports shows?—____many people like watching sports shows, ____game shows are the most popular.
—_________do you see a dentist?—Once a month.