Choose one of these modal verbs from the box to complete

Choose one of these modal verbs from the box to complete the sentences.
can may should must
1 Conflicts ... lead to bad relations.
2 We ... hear what the other person is saying
3 We ... prevent conflicts.
4 We ... have respect for other people.
5 Political parties ... resolve conflicts by peaceful means.
6 States ... prevent war if they decide to resolve conflicts peacefully.
7 You ... have better relations with people if you resolve a conflict peacefully.
8 You ... learn about conflict resolution if you read books about conflict.
9 You ... have more friends if you learn to resolve conflicts peacefully.