Fill in the gaps, using MUST, NEED’T, HAVE TO, OUGHT TO, BE TO, SHOULD :
1) She’s crying . She_ be upset.
2) You _buy tickets beforehand.
3) Lilly _ come at 3. But she hasn’t come yet.
4) You _ be careful when you cross the street.
5) I_ return to the hotel because of the rain.
6) Tommy _ pump up the tires.