Which issue should be corrected prior to the proofreading stage?
usage errors
sentence variety
spelling errors
grammar mistakes

The spelling errors could be corrected. This describes the defination of proofreading. It means reading ur text over and fixing the spelling errors.

Dr.king , i would take my mental flight by egypt and i would watch god’s children in their magnificent trek from the dark dungeons of egypt through, or rather across the red sea, through the wilderness on toward the promised land.his  speech"i  have a dream" to encourage people that change will come. this  speech  was very important during the civil rights movement and was a contributing factor in the end of racial injustice in society. the  intended audience  of "i  have a dream" is white people. i hope this

Neither don’t use either