1. All of the children of the Smith's really like playing rackets(keen)

=> All of the children of the Smith ARE really KEEN ON playing rackets

2.The thing that I hate most is motor racing, and i will never do it in my life (detest)

=> I DETEST MOTOR RACING MOST, and i will never do it in my life

3. The harvest festival in my hometown usally starts in October, but this year it started in the middle of september ( earlier)

=> The harvest festival in my hometown usally starts in October, but this year it started EARLIER ,in the middle of september

4. It takes a buffalo about half of a day to plough that fiald, but a machine can do it with an hour ( faster)

=> It takes a buffalo about half of a day to plough that fiald, but a machine can do it FASTER, with an hour

5. In cities, classrooms are equipped with speakers, computer, projectors; however, classroom in the countryside don't have any( better equipped)

=> In cities, classrooms ARE BETTER equipped THAN in the countryside with speakers, computer, projectors