"A" is the correct choice :)
        
                    
             
        
        
        
The infinitive phrase in this sentence is to speak clearly, and it is used as a subject of the sentence. What/who is essential to being understood? To speak clearly. 
        
             
        
        
        
Answer:
'Be going to' has TWO meanings, both of which express future actions.
'Be going to' can be used to make predictions.
Ex.   According to the weather report, it <u>is going to</u> be cloudy tomorrow.
'Be going to' is also used to express a prior plan (i.e., a  plan made before the moment of speaking.)
Ex.   I <u>am going to</u> attend my brother's graduation on Saturday.
Explanation:
 
        
             
        
        
        
Answer:
1. C
2. A
3. A
4. D
5. A
6. A
7. A
8. D
9. D
10. B
Explanation:
Synonym is similar and antonym is opposite. 
 
        
                    
             
        
        
        
The plot concludes in the "resolution" stage