Quá khứ đơn hay quá khứ hoàn thành đơn giản?

Hoàn thành báo cáo với dạng đúng của từ trong ngoặc ở thì quá khứ đơn hoặc thì quá khứ hoàn thành đơn giản.

The chart shows the percentage of people aged 65 and over in The United States between 1900 and 2000. In the year 1900 just over 4% of the population was  aged over 65. However, by 1960 this figure (double).

The number of people aged between 75 and 84  (remain) fairly steady  between 1900 and 1930, making up only 1-1.3% of the population The figure  (begin) to rise more significantly in 1940 and by 1970 it  (triple) to reach 3% of the population.

Although there  (be) no change in the number of people aged 65-74 between 1960 and 1970, the number of people aged 75 and over  (increase) during this time. By the year 2000, 12.4% of the US population  (reach) the age of 65 or more, although this was slightly lower than in 1990 when it  (peak) at 12.6%.

The chart shows that today people in the United States can expect to five longer than in 1900. By the year 2000 more than 12% of the population  (manage) fo live to the age of 65 and over compared to only 4.1% in 1900.