Bonjour, voilà quelques éléments de réponses.

Exercice 3 :

1) Where has he been ?

2) Where have they been ?

3) Where has she been ?

4) Where has it been ?

Exercice 5 :

1) He's gone to the bank.

2) She's gone to the emergency.

3) He's gone to the post office.

4) She's gone to the bus point (pas sûr de celui-là).

En m'excusant de m'être trompé ^^' Bien à toi !