根据下列句子所给汉语意思或提示,写出空缺处单词的正确形式。
Scientists are ________ (调查) into the cause of cancer.
To get the job done, one should be ________(精力充沛) and hardworking.
As a ______(奖赏)for passing her exams, she got a new bike from her parents.
Dilma Rousseff, who won 56% of the _______ (选票), was elected President of Brazil.
The old lady likes (spy) into other people’s affairs.
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