根据句意及汉语提示，写出各单词的正确形式，每空一词.
My father ____________ (承诺) to buy me a new bike as my birthday gift yesterday evening.
To our ____________ (吃惊), he succeeded in passing the exam.
It won’t do them any good, but it won’t do them any harm, __________ (也).
The boy has made an even ____________ (愚蠢的) mistake. What a pity!
The clever boy has no ____________ (困难) making a decision.