Add spaces: 'MereisalreadyaconsiderablenumberofworkersintheCentralCommitteeofourFrenchparty.

Answer: 'Mere is already a considerable number of workers in the Central Committee of our French party.

Add spaces: WearepleasedtobeabletowelcomeyouandyourfamilyintheSouthofFrance.

Answer: We are pleased to be able to welcome you and your family in the South of France.

Add spaces: apainfulredswellingontheskin,thatisfilledwithpus.

Answer:
a painful red swelling on the skin, that is filled with pus.