F Underline the correct option in the following sentences and rewrite them. 1. Notice at the zoo: You (must not/need not) feed the animals. 2. You (must not/need not) take leave from work, but you must take the med regularly. 3. We (must not/need not) drive so fast; there is plenty of time. 4. Notice at the school: Lifts (must not/need not) be used during the fire drill 5. You (must not/need not) send me a formal invitation letter. I'll be very happy to be present at the ceremony.