table question( question_id // id of question
question_title // title of question
question_mark // mark of question
qusetion_demo // demo of question
question_type // type of question )
table select_item( select_id // id of select
question_id // id of question
select_order // order of select in one quesiton
select_title // title of select in one question
selected // if selected)
table fill_item(fill_id // id of fill
question_id // id of question
fill_title // title of question
fill_text // the text will filled
fill_mark // the mark of fill in one question)