In the following passage some of the words have been deleted. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

Yes, there's definitely something to be said about (1)______ the perfect cup of coffee. I'm staring (2)_______ the machine again, but today l'm smiling. I've done it - the correct amount of foam, the (3)________ like silk and the little dusting of chocolate, (4)________ a perfect heart on the top. It's just a shame that it's me who is drinking it, not a/an (5)_______ customer.