Mr. Smith, why are you always asking me to do the difficult work?—Because you _______ do such a thing and nobody else is fit for it.

Today is ___Teachers’ Day and ___ teachers in our school are all happy.

Under no circumstances _______ the difficulties when they were on an expedition to the Antarctic．

She looks much without her glasses．

依次填入下列各句横线处的词语，最恰当的一组是①锦袋内掣出那管凤箫，李师师接来，口中轻轻吹动，端的是 之声。②他的表情很细腻，可以说一丝不苟；嗓子也很响亮，唱几句真的是 。③人民以胜利的欢呼，对我们历史上这一 的大事件，表示了他们的赞许。