—Do you know that a 13-year-old English boy has done a nuclear experiment successfully? —_______ unusual work he has done!
These _______ her parents. That _______ her sister.
---What’s this _____ English? ---It’s an eraser.
Two and four is________.
--- What’s this, Xiao Hong?— It’s _____ orange.
Must we sweep the floor right now? No, you _______. You can do it later.