1. ... grandfather ... policeman.
2. ... churhes ... .
3. ... cities ... towns.
4. ... journey.
5. ... children.
6. ... salesmen.
7. ... businnesman's wife.
8. ... parents ... holidays ... .
9. ... cousins ... a party.
10. leaves ... .
1can2can't3can't4can't5can't6can7can8could9couldn't10mustn't11must
12can(must)13must(can.can't.mustn't)
14mustn't15mustn't16must(should)
17may18can't19mustn't(shouldn't)
20may
1. is
2. are
3. are
4. are
5. am
6. am
7. are
8. are
9. are
10. am
11. is