根据下列句子及所给汉语注释，写出空缺处各单词的正确形式，每空只写一词。
Nancy is too young to look after _______ (她自己) .
I’m sure he is the                   (主人) of the dictionary.
Stop wearing those ________(愚蠢的) earrings, dear.
At last, they s           (成功) crossing the river on boat.
I have to take a ___ _____ (医学的) exam before going abroad.