the secret of nature, the youngscientist has little time for entertainment

下列句子中加点成语使用正确的一项是（ ）

She is only a child, so there is no need ______ her so much stress.

He once studied in Zhejiang University, ________he went abroad for further study.

ecturer, she doesn’t dare to speak in _____ public; she is thought of as _____ failure.