Thieves entered the house. Once Stephan decided not to go to school and he didn't say anything to his parents, they were working. He was sitting in his room and drinking tea (past cont). Suddenly he heard that someone is walking in the corridor. He was scared but didn't lose courage and called the police. They said they would come in 5 minutes. Stephan decided to sit in the room. But the theives started opening the doo. Stepa took a vase and stood next to the door. The door has opened. Stephan with all his strength has hit the thieve's head by vase. He fell on the floor. Stephan looked at the person and was very surprised. Turns out it was his father.
Thieves broke into the house!One day Steve decided not to go to school and stay home, and parents he didn't say anything, they were at work. He sat in his room and drank tea. But suddenly he heard someone walking in the hallway. Steve was scared , but not confused, he called the police. He said he would be there in 5 minutes. Steve decided to sit in the room. But the thieves began to open the door. Steve picked up the vase and stood next to the door. The door opened. Stepan with all his strength struck the head of a thief in the vase . He fell. Steve looked at the face, very surprised . It turns out it was his father.
Поскольку в первом предложении время, во втором оно будет тоже. Далее идёт перечисление подлежащих с одним глаголом, значит будет множественное время.
Итого: were
ответ: were