Don't make your children ________ for hours reading books in ________ a dark room.
Han Mei often practices English.
_____ 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.