In this case, you don't need labels. Refer to the following.
LOCATE 5,8:PRINT"sentence 1"
WHILE(BUTTON(3)AND #A)==0:VSYNC 1:WEND
WHILE(BUTTON(3)AND #A)!=0:VSYNC 1:WEND
LOCATE 3,9:PRINT"sentence 2"
WHILE(BUTTON(3)AND #A)==0:VSYNC 1:WEND
WHILE(BUTTON(3)AND #A)!=0:VSYNC 1:WEND
LOCATE 2,10:PRINT"sentence 3"
WHILE(BUTTON(3)AND #A)==0:VSYNC 1:WEND
WHILE(BUTTON(3)AND #A)!=0:VSYNC 1:WEND
...
2そうだね 未プレイ