I.
2. the nicest
3.bigger
4.smaller
5.prettier
II.
3. Vicki is shorter than Kim
4. Ponies are usually the fattest horses
5.Deer is the shyest aimal in the New Forest
6. Is Math the easiest subject for Rob?
7. Mark is taller than Rob
8.England is the largest country in GB
(это же не трудно, лучше делать самостоятельно) ;)