1) The bus didn’t come and we … go on foot.
a) must b) had to c) should
2) I … go and see the doctor at 11 o’clock tomorrow.
a) must b) have to c) am to
3) The children … play in the street.
a) must not b) don’t have to c) needn’t
4) You … buy this book. I have it.
a) needn’t b) mustn’t c) may
5) We … speak English very well.
a) may b) can c) have to
6) … you pass me the salt, please?
a) should b) could c) might
7) You … knock before entering.
a) ought to b) are to c) have to