You use preterite to describe an action that took place and was fully done, Ex. José entro a la habitación, you can see John went into the room, he completed the action. On the other hand, imperfect tense doesn't specificate if the action was completed, Ex. José entraba a la habitación, it doesn't tell us if José fully entered the room.
Tomar el metro is the answer.
1) is right
2)cross out A instead
3)cross out A
4)cross out B
5)cross out B
part b
1)Me llamo (your name)
2)El gusto es mío
3)Es Señor Pepe (or use whatever name you want)
4)Igualmente
5)Encantada
B- estoy es en el tiempo presente
