What traditional fill in the word, use the word "hair" to form words...?

Group words with hair and put the new group of words in brackets.

) problem, ( ) role, ( ) spirit, ( ) opinion, ( ) news, ( ) electric light, ( ) charge

(discover) problem, (play) role, (carry forward) spirit, (express) opinion, (publish) news, (invent) electric light, (launch) charge, (mobilize) the masses, (develop) cause

discover, play, carry forward, publish, publish, invent, initiate

discover, carry forward, publish, launch, launch launch develop