1) Fine. 2) Both "down" and "out" seems strange. I'm not sure what you are trying to say here. I'd say, "We slipped out of the room". 3) - 8) all fine.
Strict grammarians probably advise "... has already had ..." in preference to "... already had ...", but (at least in the U.S.) you will hear both. There is very little difference in meaning. The difference is that adverbs of past
1/ The latest software contains graphics which could once only have been imagined.
2/ Impressionist painters such as Manet and Monet knew how to use colour so as to create an image of reality, rather than a reproduction THEREOF. (meaning ?)
3/ Although the sculptor had hoped that he would be able to finish the