First, read the English article below.

Also after initials, as in Alfred D. Smith.  Every sentence contains at least one punctuation mark -- the one at its end. The most common of these sentence-ending punctuation marks is the period (".", also called a "full stop"). This simple dot is used to mark the end of a sentence that is declarative. Most sentences are declarative. Any sentence that states a fact or describes or explains an idea is declarative. Here is an example of a period (full stop) being used correctly at the end of a sentence:The accessibility of the computer has increased tremendously over the past several years. The question mark ( "?" ) used at the end of a sentence denotes an interrogative sentence -- basically, a question. Use this punctuation mark at the end of any question, query, or inquiry. Here is an example of a question mark being used correctly at the end of a sentence:What has humanity done about the growing concern regarding global warming? The exclamation point ("!", also called an "exclamation mark" or "shout mark") suggests excitement or strong emphasis. The exclamation point is used to end exclamations -- short expressions of intense emotion that are often only one word long. Here are two examples of an exclamation point being used correctly at the end of a sentence:I can't believe how difficult the exam was!  Eek! You scared me! 

Now, please write a short abstract for it in Vietnamese. Abstract:
Sử dụng dấu chấm hết câu để kết thúc các câu và lời phát biểu tường thuật. Sử dụng dấu hỏi chấm để kết thúc câu hỏi. Sử dụng dấu chấm than để kết thúc câu cảm thán.