71. What would be the best title for this passage? (A) Plants and Animals (B) How Plants Defend Themselves (C) Attacks and Defenses (D) How Animals Eat Plant Leaves

29.They _______ on the program for almost one week before I joined them, and now we________ it as no good results have come out so far. (A) had been working; are still working (B) had worked; were still working (C) have been working; have worked (D) have worked; are still working