There are shapes which are cut into sections and would be made into a larger shape if they were fitted together. One good example of this would be a half circle and another half circle; because if they were joined together, they would be a full circle.
With this in mind, there are different forms through which smaller shapes can be fitted together to become a larger shape and they could be a half trapezium, etc.
Please note that your question is incomplete so I gave you a general overview so that you could have a better understanding of the concept.
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The sentence in which the infinitive phrase functions as the subject is the second one - To convert sunlight and energy into food is the end result of photosynthesis.
The line from John Keats' poem that is written in iambic pentameter is C. Fade far away, dissolve, and quite forget.
Pentameter means that there are 5 meters in a line; one meter consists of 2 syllables, which means that a pentameter has 5 * 2 = 10 syllables in one line. The only option here that has 10 syllables is C. A has 6, B has 6, and D has 11.