根据句意和汉语注释，在相应的横线上，写出单词的正确形式。

根据句意和汉语注释，在相应的横线上，写出单词的正确形式。
小题1:The hostess （点头）to show that she agreed with us at the show.
小题2:I am often (提供) some useful help by my teachers and classmates.
小题3:I have ordered several ________(册)of this book from abroad. Would you like to have one?
小题4:Can this kind of robot be (可获得的) in the nearest supermarket?