这部电影非常精彩，我很推荐 is totally fine. Think of [topic +comment] structure
comment 1 [非常精彩]
comment 2 [我很推荐]
you can add as many comments as you want and all the comments describe one topic: [...
I think that all the (xB) sentences have stressed on the subject (I mean 主语).
For example, (1B)“在芬兰有很多的湖” have emphasized on 芬兰, means that the country Finland that have lots of lake, while the (1A) ...