7 Ron is a very ... swimmer!

Grammar Exercise 7: Fill in the blank.

The sentence uses the structure 'a very ... swimmer'. This indicates a superlative quality. However, without further context or comparison to other swimmers, 'fastest' might imply a comparison to all other swimmers, while 'fast' describes the quality. Given the options, and the common use of 'very' with adjectives, 'fast' is a more general descriptor here.

Answer: b fast