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Must I connect all 3 LMT84DCKT's Gnd Pin to ground?

Other Parts Discussed in Thread: LMT84, LMT87, LMT86, LMT85

I tested the LMT84DCKT sample today.  

There are 5 pins. 

There are 3 gnd pins. 

I thought, connecting pin-1 gnd to the ground is enough.  

I left pin-2 gnd and pin-5 gnd open.  

Temperature is about 26 degrees C, so I expected 892mV at pin-3 output. 

But, when I applied 3.3V to pin-4 Vcc,  I got 1.43V at pin-3 output. 

So, the temperature is less than -50 degrees C?

Must I connect the all 3 gnd pins to the ground?

Hope to get the answer soon!