①7053 is a four-digit number. The highest digit is thousands, and 0 is hundreds.

② Among 5040, 5004, 5400, 4005, 4050 and 4500, 5040, 5004, 4005 and 4050 read a zero while reading, while 5400 and 4500 cannot read a zero.

③3626 meters, writing: 3626; 9 1 19m, writing: 9119; One fifth, writing: 15.

So, the answer is: four, a thousand, a hundred; 5040、5004、4005、4050,5400、4500; 3626,9 1 19, 15.