EXERCISE 1: Complete the sentences. Use the information in the box and the modal verb in parentheses. quit it at once be very happy leave the building in order go out for a walk find another one be very worried come to visit me more understand the lectures well buy a smaller one 1. If you have toothache, you mustseethedentisL ............................ (must) 2. If it rains, we ................... (should not) 3. If the class is full, I......................... (will) 4. If it costs too much, we.................. (must)  5. If you don’t come home early, your parents........................... (may) 6. If that job is boring, Susan ....................... (may) 7. If you listen carefully, you.............................. (can) 8. If a fire breaks out, everyone................................. (have to) 9. If you have more time, you....................................... (ought to) 10. If you phone your parents more often, they..................................... (must)