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CV and GCV for finding smoothness parameter

I received an assignment that I have to do in R, but I'm absolutely not very
good at it.
The task is the following:
http://www.nabble.com/file/p22804957/question8.jpg 
 
To do this, we also get the following pieces of code (not in correct order):
http://www.nabble.com/file/p22804957/hints.jpg 

I'm terrible at this and I'm completely stuck. The model I chose can be
found in here:
myknots6 = c(20,24,34)
p.spline8 = spm(accel ~ f(times,basis="trunc.poly",degree=2,knots=myknots6))

Can someone please help me with this task? I'm kind of desperate.

Thank you!