Read each sentence and use the drop-down menu to determine which revision, if any, is needed.

the winning lottery numbers are three, fifteen, nineteen, and twenty seven.
add a colon after “are.”add a hyphen between “twenty” and “seven.”delete the comma after “nineteen.”no revision is needed.

at least one-fourth of the paintings—which are all by american artists—will be included in the special exhibit.
delete the hyphen in “one-fourth.”delete both dashes. replace the dashes with hyphens. no revision is needed.

mr. singh, an accomplished musician, plays three instruments: piano, trumpet and clarinet.
add a comma after “trumpet.”delete the commas around “an accomplished musician.”replace the colon with a semicolon. no revision is needed.