12. Two miles (is/ are) all that we need to walk today. 13. Not only the students but also the teacher (is/ are) tired. 14. He said that five dollars (was/ were) the usual charge. 15. Neither the newspapers not the radio (has told/ have told) the true story. 16. The poultry (is fed/ are fed) three times a day. 17. Here (comes/ come) one of the finest experts in all Europe. 18. One-third of the world (is/ are) rich; two-thirds of the world (is/ are) poor. 19. Economics (is/ are) a difficult course for some college students. 20. Three weeks (is/ are) a long time to wait for him. 21. Either Jim or John (lives/ live) here. 22. There (was/ were) a lot of traffic on the road last night.