Please help me with my punctuation worksheet.?

[Jonathan L]

Because recent developments have taken place the nation’s future workforce may include an increasing number of older workers (1). Mandatory retirement has become a thing of the past and the federal government has reduced or completely eliminated earnings restrictions on Social Security recipients (2). In April 2000 the President signed a congressional bill that ended earnings penalties for Social Security recipients aged 65 or older (3). This important bipartisan signing ceremony took place at the White House 1600 Pennsylvania Avenue Washington D.C. in the presence of congressional leaders of both parties (4). Since this bill a long-awaited piece of legislation by senior citizens allows older Americans to work and collect Social Security workers will stay on the job longer (5). Certainly older workers bring to the job a variety of skills excellent attendance records and years of experience (6). In addition a strong growing economy is increasing the demand for new workers of all ages (7). Many corporations however still offer employee pension plans which encourage early retirement (8). Nevertheless some economists believe that early retirement plans may be useful to the corporation for the short term not for the long run (9). Therefore younger workers you may find more competition in the job market from workers of all ages (10).
I am having a hard time placing the commas in the right place.

[Seamus Romney]

Because recent developments have taken place, the nation’s future workforce may include an increasing number of older workers: (1) Mandatory retirement has become a thing of the past and the federal government has reduced or completely eliminated earnings restrictions on Social Security recipients: (2) In April 2000 the President signed a congressional bill that ended earnings penalties for Social Security recipients aged 65 or older; (3) This important bipartisan signing ceremony took place at the White House, 1600 Pennsylvania Avenue Washington D.C,. in the presence of congressional leaders of both parties; (4) Since this bill, a long-awaited piece of legislation by senior citizens allows older Americans to work and collect Social Security workers will stay on the job longer; (5) Certainly, older workers bring to the job a variety of skills, excellent attendance records and years of experience; (6) In addition, a strong growing economy is increasing the demand for new workers of all ages; and, (7) Many corporations however still offer employee pension plans which encourage early retirement.

Nevertheless, some economists believe that early retirement plans may be useful to the corporation for the short term - not for the long run. Therefore, younger workers: you may find more competition in the job market from workers of all ages.