根据句意和汉语注释，在答题卡对应题号的横线上，写出单词的正确形式。
Why not hold a party for your mother’s _______________ (40) birthday.
Tom failed the English exam because of his ___________ (care).
I guess these bags are those _______________ (direct). Please keep them in your office.
I worked out the problem without any ________(difficult).