There are many ways you could paraphrase this, but one option would be "Experts think the recession will soon pass", since "Financial" and "optimistic" are implied.
Answer:
'He had left the house' can function on its own as a sentence. That's the independent clause. 'before mother arrived' cannot function on its own. it is a sentence fragment, or a dependent clause
Answer:
I'm pretty sure its B but I'm not positive
