𝗥𝗲𝗮𝗱 𝗮𝗻𝗱 𝗳𝗶𝗹𝗹 𝗶𝗻 𝘁𝗵𝗲 𝗴𝗮𝗽𝘀.
In certain schools, students _____ stand when their teacher enters the room.

• must
• could
• can
• may