Answer:
a. on
b. I don't think here a preposition is needed as "This is the key to my room" is a complete sentence.
c. in
d with
Hope it helps!!
Have a nice day:)
 
        
             
        
        
        
Answer:
"I" message.
Explanation:
<u>"I" message or "I" statement is the statement based on the speaker's point of view</u>.
<u>"I" statement/message concept was developed by Thomas Gordon in 1960. According to this concept, the speaker communicates his/her feelings to the listener</u>. 
These statements are helpful to convey an assertive message to the listener rather than offending them by using "you" statements. "I" statement also helps in positive communication skills. 
So, the correct answer is "I" statement. 
 
        
             
        
        
        
Answer:
a. i JUST TOOK THE TEST ON USA TESTPREP.
Explanation:
 
        
             
        
        
        
Its - no apostrophe. As the apostrophe would make it a conjunction word of it and is