@waqas2008.
u can drive by shifting to D3 and D2 however doing that on regular basis can affect the transmission as it is not designed to be used on permanent basis.
Secondly if u take a start in D2, civic's transmission will not take start in 1st gear but will start from 2nd gear which will actually be sluggish and u will feel lack of pickup. D2 is actually designed to either hold the car in 2nd gear when going up or down a hill or to take a soft start on ice and snow to avoid slippage
best thing is to drive in D and use D3 and D2 as and when required e.g like overtaking, climbing a hill, driving in snow.