Answer:
prevalence → verb → to prevail
potentially → noun → potential
vulnerable → noun → vulnerability
accessible → verb → to access
censorship → adverb → censorious
volunteer → adjective → voluntary
dubious → noun → dubiousness
system → adjective → systematic
regular → verb → to regulate
suitability → verb → to suit
Explanation:
In the English language, especially when it comes to words originated from Latin, it is common to change words with the addition or removal of certain parts -- the affixes. Notice, for example, that to transform "vulnerable" into a noun, we added a suffix (an ending): "vulnerability". On the other hand, to transform "censorship" into an adverb, we changed suffixes: "censorious". It is important to know and understand the use of affixes. They are a helpful means to figure out the meanings of new words.
How many miles you go in one hour
Answer:
I would think that this means that he can use his happiness to hide his true face and emotions. He can put the mask on and appear happy to others, when really he is not. This acts like a mask because a mask makes your face look like something it isn't. Like on Halloween when you dress up, wearing a mask makes you look like what you desire to look like, not what you really are.