Fill in the blanks according to the first letter given to complete the sentences (根据首字母填入适当的单词)
1.John is more i________than Tom.   
2.I have a s________everyday in summer.   
3.I go to school on foot i________of by bike.   
4.It is very i________for us to learn English well.   
5.Water c________almost three quarters of the Earth.   
6.Tigers are one of the most d________animals.   
7.We can save water by f________a dripping t________.   
8.Farmers need to water the c________and v________on their farms.