Ex.2
Fill in: may, can, could, had to, didn't have to.
1 My grandfather ..... ride a camel for miles when he was young.
2 You ..... buy the book. You could have borrowed it from the library.
3 ..... I see your ticket, Sir?
4 We ..... call a taxi because the buses from the airport weren't running.
5 ..... we visit our cousins in Kazakhstan this summer, Mum? ​