You ____ wear a helmet when riding a bike. (obligation) Students ____ use their phones during the exam. (prohibition) We ____ take the bus if we don’t want to walk—it’s optional. (lack of necessity) You ____ drive here without a license. (impossibility) Employees ____ park in the manager’s reserved space. (prohibition) You ____ return this book to the library by Friday. (obligation) Visitors ____ take food or drinks into the gallery. (prohibition) They ____ work on the project today—it’s already finished. (lack of necessity) He ____ be at home because I just saw him at the store. (impossibility) People ____ enter this area without a pass. (prohibition)

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