1. Outside the house (was / were) two men in gray waiting in the dark.
2. Many Chinese (goes / go) to the US to study in universities.
3. Parapsychological phenomena (attracts / attract) many people .
4. Economic crises occurring almost every year (has / have) hindered the development of the country.
5. What criteria (has / have) been employed in the selection of the crew members?
6. A financial support program apart from the scholarships given to the students (has / have) been put into practice this year.
7. The number of students who register in these courses (changes / change) every year.
8. The statements made by the prime minister (conflicts / conflict) with the statements of other members of the party.
9. The ability of most humanoid apes to learn new patterns of behavior (surprises / suprise) the scientists.
10. No uniform policy against terrorists who are threatening the world peace (has / have) been agreed upon.