1) haven’t bought yet
2) did you study
3) have eaten
4) has been walking
ответ: Буду сразу писать правильный вариант 1. We haven’t bought the house yet. 2. Did you study German? 3. She has eaten a cake. 4. My friend has been walking on the street (хотя лучше говорить outside) for 2 hours.
Объяснение: надеюсь