Imperatives with'or...will...'的句式特點, 例子, 練習和答案?

There are three moods:-
(a) Indicative----statements and questions.
(b) Imperative---(grammar) of the form of a verb or a sentence expressing a command from the command of the "President"; the Imperative mood imperatively; hence giving commands eg:-Close the door ; Stand up ; Help attack !
(c) Subjunctive---to express wishes, doubt and conditions contrary to facts.
Referring  to special points, samples, exercises and answers :- we have (b) Imperative adj  means urgent; essential; needing immediate attention:-
eg:-Is it really imperative for China to have such a large army ?
eg:- Is it imperative that they should have them to have millions of inter-continental ballistic missiles aiming at TW ?
Imperative also means not to be disobeyed; done; given with, authority:-
eg:-The President's order are imperative. "go at once !" , he says , with an imperative gesture in Beijing.