_______ is a fact that English is being accepted as an international language.
A、ThereD
为了保持句子的平衡，往往用先行词it作形式主语或形式宾语，而把真正的主语或宾语放到后面，尤其是that引导的主语从句往往用先行词it作形式主语。此句也可以改写为：ThatEnglishisbeingacceptedasaninternationallanguageisafact.
Lyingundertheskull,thehumanbraincontainsanaverageoftenbillionnervecellscalled______.
Youngerchildrenarecurious________howthingswork，andmanyofthemwanttotakeaparteverythingwithintheirreach.
EmpiricalstudiesshowthattheprocessofSLAisaprocessofconstructingandmodifyingrulesofcommunication.
Childrenhaveanatural________abouttheworldaroundthem.
―________finedayitistoday!
