Qiandao Lake, widely known __________ a tourist site, is famous __________ its clear and drinkable water.
31. You see the lightning _____ it happens, but you hear the thunder later.
30. She had no idea how it _____ that her husband met with trouble again.
29. As far as I’m concerned, education is about learning and the more you learn, ______.
28. The Olympic Games are being _____ live to many countries.
27. The child tiptoed quietly to the bird, _____ into the forest when he was about to catch it.