Write in was / were
1. your mum tired yesterday?
2. you hungry yesterday evening?
3. it cold yesterday?
4. your teacher sad yesterday?
5. your pet hungry yesterday?

1. was 2. were 3. was 4. was 5. was

Объяснение:

1) was your mum tired yesterday? (your mum - тоже самое, что и she, поэтому используем вс глагол was)

2) were you hungry yesterday morning? (для you/we/they используется were)

3) was it cold yesterday? (когда речь идёт о погоде всегда используется местоимение it, то бишь в этом случаем будет was)

4) was your teacher sad yesterday? (teacher = he/she)

5) was your pet hungry yesterday? (для животных в английском языке всегда используют местоимение it)