Choose the correct options to complete the sentences

1. Do you think that school uniform
   [was able to|should|shall] be introduced everywhere?
2. All the doctor's prescriptions
   [must|might|could] be followed.
3. Stricter governmental measures
   [have to|might|must] help the environment.
4. They
   [ought|could have|could] at least try to be more polite with her.
5. She
   [can|may|has to] speak two languages at her age of 5.
6. Those who take much risk
   [have to|may|would] get into trouble.
7. I
   [need to|ought|has to] have my blood pressure checked.
8. It
   [has to|shall|would] be more effective to use other devices for this kind of job.