Section 1 - Q 19
I can't do this one either. I've contacted the author of the question for an explanation.
Our new forum has an option to add a 'spoiler' which only shows content to those who want to see it. As many people haven't done this question yet I've added it as a spoiler. Click on spoiler to see response.
Warning: Spoiler!Section 2 - Q 2
This one seems ok to me. I'll try to explain in writing. The image has been reduced in size to fit on the forum.

The 2 large objects are mirror images of each other (about y axis) so that rules out c
The small objects are always the same colour as the large objects they are touching so that rules out a,d and e
That only leaves b, which fits the above requirements.