What ______ you ______ when the telephone rang just now?
_____ wonderful time they had in HongKong!.
Lily is so smart in her class.She usually spends the_____time and makes the_____mistakes in her homework.
If_____litters, our world will be more beautiful.
—Can the plane fly _____ the Atlantic Ocean?—Yes,but it needs to go_____the clouds for hours.
—Can you tell me _____when the teacher came into the classroom?—Sorry,I don’t know.