According to the internet, the Friar is referring to Juliet's parent that them crying is normal and natural, but since Juliet is in a better place, they should rejoice for the dead and that her soul is still pure when she goes up to heaven because she is young.
Or,
Natures tear meaning natural tears, merriment meaning happy. It is natural to cry over the death of a child but they should be happy she is going to be in a better place.
They act childish and feeble
The university has appointed George Mill, PhD, to head the research project.
Rev. David Forrester will preach at the revival.
Mrs. Roberts announced her retirement after teaching for 35 years.
The Hon. Kyle T. Berringer presides over the Third District Court.
Those are correct