This exercise leaves a void that needs to be filled by a word or group of words that fall into a particular category, and thus test your knowledge. Here are some examples: these filler exercises will help you work on everything we have learned in the past and thus test your knowledge of English grammar. Fill each void with a singular shape or plural form. Advanced levels >> grammar Worksheets >> the gap filling exercise, which focuses on the correspondence between the subject and the verb. Fill in the blanks with correct verbs, indicated in parentheses: You have your 15 questions free for today. Want to play more? You must register. . « You __________ participate in the ceremony if you do not wish to do so; it is optional. This gap can be filled by the negative phrase « does not need ». . If I (a) …..