根据句意及所给的中文,写出恰当单词,使句子的意思完整、正确。
Red and Black are a good ________.(搭配)
You should choose your hobby ________ to the time you have.(根据)
There is no ______ that you’ll be successful in the future.(怀疑)
She is ______ with herself in her study.(严厉的)
Some people decided to donate their bodies for medical ________ after the death.(研究)