根据句意用所给词的适当形式填空。
小题1: Jack usually checks his test paper ___________ (careful) before handing it.
小题2: Mary thinks ___________ (study) grammar is a great way to learn a language.
小题3: –What _______ (happen) to Dave on April Fool’s Day? –He was fooled by his friends.
小题4: Students in this school want to be __________ (volunteer) during this winter vacation.
小题5:Liu Li was the ________ (win) of last year’s English Speech Competition in our school.
小题1:carefully
小题2:studying
小题3: happened
小题4:volunteers
小题5:winner
题目分析：
小题1:通过题干可知，本空是修饰动词check的，故应该用副词carefully。
小题2:根据题干，本句的意思是“玛丽认为学习语法是学语言的好方法。”本句应该是动名词做主语的，故用studying。
小题3:通过He was fooled by his friends.可知，本句应该是过去时，故填happened。
小题4:根据主语 Students可知，此处的“志愿者”volunteer应该用复数形式，故填volunteers。
小题5:根据题干，本处应该是表示人。本句的意思是“刘丽是我校去年英语演讲比赛的获胜者。”故填winner。
点评：完成此类题目，首先应确定所填词的词性，还应注意固定用法和词性的变化，如动词的现在分词和过去式，形容词和副词以及名词的数等；要关注句子的时态和词的位置。还要注意结合前后句中的关键信息。