Use the adjective in brackets in their correct forms of comparison to complete the sentences

I.Use the adjective in brackets in their correct forms of comparison to complete the sentences.
1.Tea is ______________________ coffee. (cheap)
2.The new harvest machine is ______________________ than the old one. (effective)
3.The countryside is ______________________ the town. (beautiful)
4.A tractor is ______________________ a buffalo. (powerful)
5.My sister is ______________________ me. (tall)
6.Blue whales are ______________________ elephants. (heavy) 
7.The Mekong River is ______________________ the Red River. (long)
8.Do you think English is ______________________ French in grammar? (easy)
9.My new bed is ______________________ my old bed. (comfortable)
10.The film about my village town is ______________________ than the book. (interesting)