Answer:
D. am .. is.. are, was, were
Answer:
ROB
Explanation:
Rob is the complete subject since he is the main "character" in the sentence. Mary is secondary. 'Rob' sent a letter to (blank). Without Rob, we wouldn't be reading about sending a letter. Hope that makes sense!
Answer:
No one really knows
Explanation:
Scientists have been reaserching this for many years, but still, no one has found the answer.
A) Discussing what you have read can help you understand what you have read.
