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