—Excuse me, Maria. Can I use your bike?—Sure. Here you are. But you must return it _____ time.
—Doyoubelievethatpaperismade_______wood? —Yes,Ido.Andyoucanseethatbooksaremade________paper.
—Doyouknow________thisafternoon? —I'mnotsure,butI'lltellyouassoonasshe________.
Ifthereis______pollution,theairinourcitywillbe ________dirtier.
BythetimeIlockedthedoor,IrealizedI________mykeysathome.
—________ English movies is helpful to learn English. —But I find _______ hard to understand when the people speak fast.