سؤال قواعد ستيب محلول — إكمال الفراغ (تدريب 6008)

To which sentence can we add the following clause? until it boils. (1) Making a cup of coffee is not difficult. (2) First, you heat the water. (3) Then, pour it into the coffee filter. (4) Wait for the water to run through the filter and then drink it.