You see the lightningit happens,but you hear the thunder later. [ ]

U.S. President Barack Obama ______ a speech at a dialogue with Chinese youth at the Shanghai Science and Technology Museum during his four-day state visit to China, Nov. 16, 2009.

His parents，_________，did not look after him very well—the elbows of his jacket were patched and his boots were badly worn

Parents complain that _____ shown on TVwill have bad influence on high school students’ moral _____

We worried about ______ he was in good health.