21．The flood d_____ the houses, leaving many people homeless.
22. I couldn’t r_____ my friend because we hadn’t seen each other for more than 20 years.
23. My grandfather prefers to have sports _____ (在户外) even in cold winters.
24. The earthquake left the city of Tanshan in _____ .(废墟)
25. The old couple loved the scenery here very much and decided to s_____ down.
