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)