(B)   根据句意，在答题卡标有题号的横线上，写出括号内所给单词的适当形式。
【小题1】A true friend can help you get out of _________ (sad) when you are unhappy.
【小题2】The Chinese engineers are still not _______ (satisfy) with the progress they have made in high-speed railway.
【小题3】Her novels are full of mysteries and they are _______ (wide) read.
【小题4】Working harder is the key to _______ (achieve) success.