In summer milk will quickly go bad_____ it is put into a fridge.
Six weeks has passed________I met you last time.
Her grandfather________for two years.
—Millie,where is Miss Li?—She________a speech on Chinese art to the first-year students in the hall.
Not only________polluted but________crowded.
Boy,your books are everywhere.Please________.A.put them upB.put them onC.put them away