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。

小题1:They talk _________（代替）of doing homework.

小题2:Grace felt _______（紧张的，不安的）when she heard the final exam would come.

小题3:She’s too busy to __________(回复)to her daughter’s letter.

小题4:You always come up with good _________(解决) to people’s problems.

小题5:She tried to stop smoking, and she_________(成功).