Task 1.
1. Elephants are bigger than lions.
2. Planes're the fastest means of transport.
3. This book is more interesting in the book.
4. The sea of Azov smaller than the Black Sea.
5. Hoverla is the highest mountain in Ukrain.
6. Train tickets are cheaper than plane tickets.
7. This bar of chocolate is more tasty than that one.
8. My mother bakes better cakes than my sister.
Task 2.
1. go
2. played
3. are
4. has
5. is
6. will