A. it makes him relaxed
B. it helps him swim as fast as he can
C. it helps him stay healthy
D. it is the easiest swimming style
A. he has a competition
B. he is hot
C. he is tired
D. he wants to relax
A. clean classrooms, halls, and the toilet area
B. grow plants, water flowers
C. help elderly people
D. collect trash, clean the toilet area, and grow plants
A. can sing and dance
B. can sing, dance, or play musical instruments
C. can write songs
D. can cook
A. unnecessary
B. necessary
C. fun
D. important
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