<span>(2) When she is worried, Lucille eats a lot. </span>
<span>(3) Jerry loves tennis, he plays everyday. </span>
<span>(4) Lucille bought a new tennis racket and brought it home. << Where should I put it? </span> So, (4) is automatically out of question. (1) and (2) seems okay with comma, but (3) is a little bit weird. (3) supposed to have 'and' in the middle, but it's not there. So, you can put semicolon there, to separate the words.