You cannot put any sort of endmark (period, question mark, or exclamation point) here because it is not a complete sentence. Complete sentences must have a subject and a predicate. You can tell there's not even a verb here, so this is just a fragment, and we would have to use a comma.
a. Very truly yours,
Answer:
A.Better
Explanation:
Better in this sentence is referred to the word must or "have to" therefore, the correct grammar is indeed A.
Answer:
When they realized that they were about to get eaten by the walrus and the carpenter.
Explanation:
Answer:
well, scientists are still looking for ways to find a cure for cancer and the virus that is going around now. hope this helps!