21. Some researchers are finding that daydreaming may be important to mental health .Daydreaming ,they say, is good means of relaxation.
A. the; / B. /; the C. /; / D. /; a
22. It’s reported that some wild animals were found in a big cave in the mountain.
A. to hide dead B. hidden dead C. hiding dead D. hidden death
23. What like to like on the soft beach enjoying the summer sun?
A. do you B. does it C. are you D. is it