1. As students, we ______ obey the school rules.
2. I missed the bus, so I ______ take a taxi.
3. Let's go to the concert together.—Sorry, I can't. I _____ go to a meeting.
4. Must I return the book tomorrow morning?—No, you need't. You _____ keep it for three days.
5. —May I try on the jeans?
—Yes, you _____.