Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
He only took a （ ） of his pudding. (mouth)
【正确答案】：MOUTHFUL
【题目解析】：
本题考查的是常见名词的衍生名词。
由a...of可知，空缺处应填名词，mouth加后缀-ful可衍生为mouthful意为“一口”，take a mouthful of意为“吃一(大)口“。
句意：他只吃了一口布丁。