Which of these activities are you most likely to do in el banco?
1) llenar el tanque
2) echar una carta
3) cobrar un cheque
4) ir a pie

It's a vocabulary question, so what you need to do is to know what the vocabulary means: 
 el banco  is the bank 

1) llenar el tanque - fill the tank   ( you would go to a gas station for that)

2) echar una carta  - send a letter (you would go to a post office for that)

3) cobrar un cheque - collect a check, yes, you would go to el banco, this is the correct answer!

4) ir a pie - go on foot. It's not necessary to go to a bank to do that!

Is the common name of the main square in central mexico city. prior to the colonial period, it was the main ceremonial center in the aztec city of tenochtitlan. however, it is almost always called the zócalo today.