写作：改变消极态度 — 英语词汇题
题目
根据句意及首字母提示补全单词：Mary used to have a bad a______ (态度) towards study. Her teacher encouraged her to c______ (改变) it and set small goals. Now she always b______ (相信) in herself and keeps working hard, so her grades have i______ (提高) a lot.