Hi Guys,
At last I managed to escape the room safely without detonating the bomb ... of course with walkthrough

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I sat still in front of my PC for more than 3hrs, blew up myself several times and play the games repeatedly trying to solve the puzzle. In the end, I just gave up and read the walkthrough.
Before reading the walkthrough .......
The Silver Key was the hardest to find and without the key, you can't get the Lighter. After collecting all the stuff, I wasn't sure what to do next.... here are some of the silly things I did ...
- make ice cubes ... take the ice cube container, open the water tap near the sink and fill it with water (select the icecube container and click the draining water). You can see the container is filled with water (select the container, click About Item). Then put it back into the fridge, after a min, take the container out and get the ice cubes (select the container, click About Item, click the ice cubes, answer yes to get the ice cubes).
- fill the glass with water ... open the tap again and select the glass. You can see the empty glass is filled with water now (select the glass, click the About Item).
- put ice cubes into the glass ... (select the glass, click the About Item, select the ice cubes, click the glass)
- put the cross on top of the brown table with candles on it ... (select the yellow cross, click on the brown table)
- in case you wanna die peacefully, light up the candles ... (select the lighter, click on the candles)