Add punctuation: RfD Reference dosis RfD is an oral reference dosis based on the assumption that a threshold limit for certain toxic effects exists
A: RfD: Reference dosis. RfD is an oral reference dosis based on the assumption that a threshold limit for certain toxic effects exists.

Add punctuation: Italy SuperEnalotto lottery results Thursday 18 June 2015
A: Italy SuperEnalotto lottery results - Thursday 18 June 2015

Add punctuation: While over half of people are sensitive to poison ivy and will react by developing the characteristic rash about 1015 of the population is highly sensitive and may have particularly severe symptoms or develop symptoms after a very mild exposure
A:
While over half of people are sensitive to poison ivy and will react by developing the characteristic rash, about 10%-15% of the population is highly sensitive and may have particularly severe symptoms or develop symptoms after a very mild exposure.