Passive investment - Yes. Active participation in business - The company should file H-1B in your behalf.

Can I stay in US for three days when the employment terminates on L1 and next employment starts after 3 days on H1B?

At any time, you are required to maintain status or depart the U.S. You may also seek to change status if you are maintaining your current status.

How can i know that USCIS had satisfied with my applications and supporting document?

It means what it says - your RFE response is being reviewed. Whether it suffices or no, you will know only when the decision is issued.

L1-A /Labor/GC

There are ways to ensure that the employment is not disrupted but your attorney who is working on your file knows better if it will work in your...

OPT to H1B COS. When I can apply for H1 transfer?

Yes.

If my friend want to divorce but he has green card which he got it 2011

Assuming this is the permanent resident card, he should be fine.

Question on RFE

What should my attorney's response be? I am sure the professional is capable to handle this simple RFE.

L1 to H1

You will decide what you should do. Here you will be guided with what the law expects of you.

COS H4 to H1 then COS H1 to H4 with an upcoming overseas trip. Need HELP !!!

How will you filed for COS from H-1B to H-4 when you probably are not in H-1B status? If you were subject to the quota H-1B start date should be...

Working on L1 when H1 is approved with Change of Status

No.