The adverbial clause is "unless you invite him". This is because this entire clause actually means "uninvited" which is a manner of his coming there. This is why it is called an adverbial clause of manner.
Answer:
They can be contracted to what's
The correct answer is A - quality control. This is a way to ensure that the products are high-quality and acceptable to customers.
I would say C. Active voice takes responsibility and should be used.
The first one because Jerry should be 'to my brother Jerry