(S (S (S (BASENP (DT The) (NN zoo)) (VP (ADVP (RB still)) (VP (VP (VBZ remains) (ADJP (JJ open))) (PP (IN for) (BASENP (NN business)))))) (CC and) (S (BASENP (NN cleaning) (NNS efforts)) (VP (VBP have) (VP (VBN been) (VP (VBN intensified)))))) (PERIOD .))