Complete the sentences with the correct passive form of the verbs in brackets.
1. Junk food must _____ at all costs. (avoid)
2. Leaflets about stress _____ at school yesterday. (hand out)
3. Anxiety _____ to lead to many serious illnesses. (say)
4. All stress should _____ harmful. (not/consider)
5. Sleep patterns _____ by too much worrying. (often/affect)

Junk food must be avoided at all costs.
После модального глагола must используется пассивная форма be + V3.

Leaflets about stress were handed out at school yesterday.
Слово yesterday указывает на Past Simple. Подлежащее leaflets во множественном числе, поэтому используется were + V3.

Anxiety is said to lead to many serious illnesses.
Конструкция is said to означает «считается, что» или «говорят, что».

All stress should not be considered harmful.
После модального глагола should пассивная форма строится как not be + V3.

Sleep patterns are often affected by too much worrying.
Для Present Simple Passive используется are + V3, а наречие often ставится между вспомогательным глаголом и причастием.