Howmanyformscanarticlesberoughlydividedinto?whatarethey?

句子写作：Thejudgehadahardtimedeciding___________________.

Withsuchapoorscoreintheentranceexam，it’s________impossibleforhimtobeadmittedtothisuniversity.

句子写作：”HappyChristmas“hesaid.

Whatarethekeyfeaturesofaresearchpaper?