Measures must be taken to prevent pollution ____ happily.
—I’m sorry to keep you waiting.—Oh, not at all, I______ here only a few minutes.
We won’t _____ other athletes in the 100-meter race if we don’t spend more time training hard.
They sold their house for only 12000 dollars, so the buyer got a wonderful______.
Pausanias lived in the place ______ we call “Ancient Greece”.
Was it in 1969 _____ the American astronaut succeeded ____ landing on the moon?