A spaceship flies at about eleven kilometers _______ second.

Do you know that Ann is ill in hospitalYes, I do. I _______ her tomorrow.

he iPhone first the market, only die-hard Apple fans bought it. But today, iPhones are everywhere.

lculations, had they been done by hand,______all practical value by the time they were finished.

In _____room, you can see a lot of things. But some of them are not _____.