Answer:
Pet owners are encouraged to register <em><u>for</u></em> the workshop on pet training and health offered by the community center.
Explanation:
The word "for" is a preposition that can be used for all types of tenses, be it present, past, or future. Its use depends on the sentence and can be used to indicate the time or duration of an event or action or to specify the use of something.
In the given sentence, "for" is used to refer to the event that pet owners must register. This means that it tells us the "what for" of the sentence.
Thus, the final sentence will be
Pet owners are encouraged to register <em><u>for</u></em> the workshop on pet training and health offered by the community center.
The author of the story is implicating that this person is a “hard lump of clay” or a “hard glinty coal” in the sentenc. Notice how in both of these examples they mention the word hard, and an object that is dull. They <em>could</em> be saying that this person was hard to befrend, talk to or whatever the content is and that they seem like a dull person.
For example, let’s call them Henry.
”Henry was a hard person to get to know, he was always very dull.”
Go here for the whole answer!!
http://www.historyplace.com/speeches/johnson.htm