Trees used to be________for cooking by the villagers in the 1970s.A.cut upB.cut downC.cut off
_____ 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.