Dưới đây là các câu đã được hoàn thành với dạng động từ đúng:

3. A lot of the students in my class **are** foreigners.
4. Success **requires** certain strategies that satisfy both the employer and the employees.
5. Each student **has** answered the first three questions.
6. Mathematics **is** the science of quantity.
7. A number of students **believe** he is innocent.
8. The staff **have tried** a lot to win the boss’s heart recently.
9. The cattle **are gazing** in the meadow now.
10. A large number of students in this school **speak** English quite fluently.
11. That amount of money **is not** enough for me to buy a new car.
12. One of the staff **has to** report the problem to the manager.
13. The staff at the school **did not feel** happy with their working condition yesterday.
14. The news on the radio **confirms** that a serious storm is approaching our city.
15. An amount of paper **is** thrown into the rivers.