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.
