that will be 【 】 useful reference book in my research

that will be 【 】 useful reference book in my research there is not much useful information in these reference book The book may be useful to me some day so I 留着 it in my study “This is ______ most useful reference book,” a teacher from 英语翻译Much more research in such a useful vein can be envisage the article which_______ most useful will be published in th things that truly would be useful in later life My father was in the army two years ago.This book will be of In my mind,that famous university will be the only way to be It may be in possible that she will be my girl friend.请各位高手帮 This is _most useful reference book I have on this subject. This is so useful a reference book ___we can use while study