We have to do things by the book. What does the underlined phrase mean?

1.The use of chemical materials in farming became so widespread because they were ¾

2.I'm ready to do ¾ I can do to help you ¾ your hardship.

3.Most people felt the punishment was far too ¾ for the crime; what the culprit did was so despicable, even ¾, as to warrant a far more severe reprimand.

4.Nobody knows why ¾ postponed until next week.

5.Sceientist estimate that the wildlife will be ¾ danger of extinction within forty years as long as numbers diminish ¾ this rate.

6.Choose the word that is most nearly opposite in meaning to the word ASSUAGE.

7.Would you mind ¾ simply a cup of tea?

8.Choose the one bold word or phrase that must be changed for the sentence $\to be$ correct. Although we are concerned about the problem of energy sources, We must not $\o(must$ not,B)[\end{if}]-->\end{if}]--> fail recognizing $\o(recognizing,C)$[\end{if}]-->\end{if}]--> the need for $\o(for,D)$[\end{if}]-->\end{if}]--> environmental protection.

9.Choose the one bold word or phrase that must be changed for the sentence $\to be$ correct. $\o(It$ is,A)[\end{if}]-->\end{if}]-->It is imperative that graduate student maintains a grade point average of '$B^{\prime} in his major$ field.

10.Choose the one bold word or phrase that must be changed for the sentence $\to be$ correct. $\o(The most$ common,A)[\end{if}]-->\end{if}]-->The most common form of treatment it is mass inoculation and chlorination of water sources.

11.“গরিবের জন্য বড়লোকের দরদটা মাছের মায়ের পুত্রশোকের মতোই”-এই বাক্যে মাছের মায়ের পুত্রশোক কথাটি কোন অর্থে ব্যবহৃত হয়েছে?

12.'লালসালু' উপন্যাস সম্পর্কে নিচের কোন বক্তব্যটি সঠিক?