Must, have(has) to. 1. I _ give up smoking.2. I _ give up smoking - that's doctor's order.3. You _ get a visa to enter the United States.4. Annie _ do her homework now.5. It's getting Late. we _ go now.6. You really _ work harder if you want to pas the exam. 7. Some children _ wear uniforms when they go to school.8. He doesn't feel well. I _ call a doctor.9. I can't come tomorrow. I_ work late.10. Julie _ go to work on foot. The buses are on strike.11. Secretaries _ answer the phone. That's part of their job.12. "You _ do your homework" said the teacher.13. "We _ invite our neighbors for dinner one day" said my husband.​