1.what wich of the following topich in the passage primarilly concerned? 
a. local research and harmful effects of fertilize
b. advantages and disadvantages of liquid fertilizer
c. a formula for the production of fertilizer
d. content, from, and effects of fertilizer 
2.the word essential in the paragraf 1 could best be replaced by which of the following?
a. limited 
b. preferred
c. anticipated
d. required
3. which of the following has the smalles percentage content in the formula 4-8-2?
a. nitrogen 
b. phosphorups
c. acid 
d. potash
4. what is the percentage of nitrogen in a 5-8-7 formula fertilizer?
a. 3 percent 
b 7 percent  
c. 5 perecnt
d. 8 percent 
5. the word designate in the paragraf 2 could best be replaced by
a. modif 
b. specify 
c. limit
d. inccrease
6. which of the following statements about firtilizer is true?
a. powders are more popular than ever 
b. solids are difficult to store 
c. liquids are increasing in popularity
d. chemical granules are difficult to apply
7. the word they in the paragraf 2 refers to
a. powder
b. solids.
c. liquids.
d. fertillizer
8. the word  convenient paragraf 2 is closet in meaning to
a. effective 
b. plentiful
c. easy to use 
d. heap to prodecu