Choose the correct answer from the box to complete the sentences. 1. john was working for 16 hours today! he very tired! 2. helen at home. i' ve called her house five times and there's no answer! 3. helen play the guitar so she's taking lessons. 4. it's poiring out. you really go out if it's not absolutely necessary! 5. i borrow your pencil, please. i' ve lost mine! 6. you park here! it's a "no parking" zone. 7. if you don't feel well, you see a doctor. 8. you come here immediately! it's an emergency. 9. you happy you passed the test. you hadn't studied at all! a) should be b) can c) must be d) mustn' t e) shouldn't f) can' t be g) should h) must i) can't