Помогите пожалуйста преобразовать в passive.
1) They must watch out for frogs crossing the road when driving there.
2)They shouldn’t call the ambulance.
3) They can’t finish this exercise without help.
4) They can read this text with the help of a dictionary.
5) They mustn’t touch these papers.

1 Frogs crossing the road must be watched out when driving there.

2 The ambulance shouldn't be called.

3 This exercise can't finished without help.

4 This text can be read with the help of a dictionary

5 These papers mustn't be touched.