Question

THEY_________SLEEPING. *

(A) WAS
(b) WERE
(C) WASN'T

3) I_______TRAVELING. *

(A) WERE
(B) WEREN'T
(C) WAS

4) WE________WORKING. *

(a) WAS
(B) WASN'T
(C) WEREN'T

5) HE________STUDYING. *

(A) WERE
(B) WEREN'T
(C) WAS​

Answer 1

They were sleeping (b)

 Terceira pessoa no plural

I was traveling (c)

 Primeira pessoa no singular

We weren't working (c)

 Primeira pessoa no plural (forma negativa)

He was studying (c)

 Terceira pessoa no singular

Espero ter ajudado :)