更新1:
According to this dictionary: http://www.merriam-webster.com/dictionary/approve Your supervisor must approve the report before it can be sent. Another example from web: http://www.delmartimes.net/2012/08/22/high-school-district-board-approves-policy-about-bond/ High school district board approves policy about bond. 甘駛唔駛要個"of"呀???? However, you can say "approve of" it in this way: I approved of what you are bullshitting in front of your followers. Can you tell me the difference between the two sentences????