In this sentence, the word "throughout" is used as a preposition.
Answer:
a) i always asked you to do it
b) dont shut the door.
c) do we drank a whole bottle each
d)why tje river drains into a lake .
e) was the chicken half cooked
This is punctuated correctly.
"Marshmallows are my favorite snack" is a complete sentence unto itself.
The comma instead of a period shows that the sentence spoken is part of the whole sentence, which includes the speaker (she) and a word to describe how the speaker said it (explained).