29. --- Guess what! I have got (A) for my term paper. --- Great! You ______ read widely and put a lot of work into it. (A). must (B). should (C). must have (D). should have

25.Ⅱ. Grammar and Vocabulary (D)irections: (B)eneath each of the following sentences there are four choices marked (A), (B), (C) and (D). (C)hoose the one answer that best completes the sentence. Leaves are found on all kinds of trees, but they differ greatly ________ size and shape. (A). on (B). form (C). by (D). in