试题题干
Fill in the blanks with an item as required.
With a modal verb:
There’s no doubt that the world 
be a duller place without artificial food colouring, but might it also be a safer place?
参考答案
试题解析
modal verb为情态动词。本句意为毫无疑问，如果没有人工食用色素，这世界会很无聊，但是否也许会更安全呢？would表假设，表示事情和说话者的假设相反。