Add spaces: Removegroupofblockiftheyarethesamecolor

Answer: Remove group of block if they are the same color

Add spaces: Whatarethesymptomsandsignsofrheumatoidarthritis?

Answer: What are the symptoms and signs of rheumatoid arthritis?

Add spaces: TomeetEurope'sdemandforfish,abouttwo-thirdsofthefishareimported(13).

Answer:
To meet Europe's demand for fish, about two-thirds of the fish are imported(13).