3. When mother (to enter) ________his room, he (to draw) ________a picture

3. When mother (to enter) entered his room, he (to draw) was drawing a picture

В данном предложении необходимо употребить глагол в Past Simple и Past Continuous. Когда мама вошла в его комнату, он рисовал картину.

Ответ: entered, was drawing