( ( Its orbit ) ( ( is ( one ( of ( ( the ( most circular ) ) ( of ( ( all ( the planets ) ) ( -LRB- ( ( ( only ( Venus ( , ( ( Earth and ) Neptune ) ) ) ) ( have ( orbits ( that ( are ( more circular ) ) ) ) ) ) -RRB- ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ Its) (NN orbit)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT the) (RBS most) (JJ circular)) (PP (IN of) (NP (NP (PDT all) (DT the) (NNS planets)) (PRN (-LRB- -LRB-) (S (NP (RB only) (NNP Venus) (, ,) (NNP Earth) (CC and) (NNP Neptune)) (VP (VBP have) (NP (NP (NNS orbits)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (RBR more) (JJ circular)))))))) (-RRB- -RRB-)))))))) (. .)))
Its orbit is one of the most circular of all the planets (only Venus, Earth and Neptune have orbits that are more circular).
(ROOT (S (NP (NNP Venus)) (VP (VBZ has) (NP (DT the) (JJS most) (NNS volcanoes))) (. .)))