Modal Auxiliaries

Is "to" needed in this sentence: "Everyone ought __ cover their mouth when they cough."

Is "to" needed in this sentence: "Everyone should __ wash their hands before means."

Is the modal possibility or permission? "Yes, Tommy, you may play outdoors until dinner."

Choose the correct completion. "I will sell the car as soon as I ___ find someone to buy it."

Is the modal possibility or permission? It may be hot and humid all weekend.

Is "to" needed in this sentence: "The students have ___ take a text on Friday."

Is the modal possibility or permission? They may travel overseas next summer.

Choose the correct completion. "It's cold in here. ___ you please close the door?"

Choose the correct completion. "She ___ be a doctor until she passes her exams."

Choose the correct completion. "It's not certain yet, but she ____ buy a new car next week."