Dude that so easy . Its calm because, you literally would need to wait for the tide to calm so you can continue your search for shells.
The answer is b
hope this helps :)
Answer: A simple subject tells us who or what the subject is in the sentence Wait by the classroom door the subject is door.
The city lies on the River Arno, and It is known for its history and its importance in the Middle Ages and the Renaissance, especially for its art and archetecture.
Answer:
I guess it's option C. while
<em>Hope it helps :)</em>
<em>Though I may be wrong :(</em>
<em>Have a great day!</em>