6. Spring is the season to s__________ the seeds.

4.Don’t smoke so much; t__________ is harmful to your health.

5 They are busy p___________in the garden so that the flowers can grow better.

3. Luckily their computer company has developed a new m__________ of testing the virus.(病毒)

2.　　　 Now more and more people buy cars. So every year we i__________ millions of cars from abroad.

1.　　　 If the soil c___________ isn’t good enough, the farmers will try to improve it.

5.　　　 Jia Sixie’s book is a practical guide ______ farming, which tells people to do things ______ the right time of the year.

IV: Word-spelling(15%)

4.　　　 Vegetables are protected _______ the wind, rain and insects in greenhouses, where the temperature is controlled ______ computers.

3.　　　 New techniques should increase agricultural production but also be friendly ______ the environment, not harmful _______ the environment.

2.　　　 _______ the early 1990s , scientists started to develop new techniques to increase agricultural production _________ harming the environment.

1.　　　 It is ____ this arable land that the farmers produce food _____ the whole population of China.