1. We have decreased our involvement (in, by, to) children's books.
2. Car sales decreased sharply this year. (in, \, of)
3. The price of this toy decreased (in, of, from) 50.000 dong to 40.000 dong last week.
4. The percentage of students studying abroad decreased (to, at, on) 50% this year.
5. The number of people buying this item in 2020 is 1000. The number of people buying this item in 2021 is 600. Therefore, in 2021, the number of people buying this item decreased (in, to, by)400.

The bar chart illustrates the average which male and female students spent in school, while the pie charts give the about the percentage of different types of education participated by adults 2000 to 2010 in Singapore.

Overall, while the number of years which adult males spent on school saw an upward trend, the opposite was true for the rest of the category. In terms of pie charts, the level of education which people obtained decreased the period except for high school and qualifications.

1. sha p decrease
2. signif cant decrease
3. gradu l decrease
4. slig t decrease
5. ste dy decrease