1.
1. _____ one of the most important tools in modern medicine.
2.
2. The Amazon River, _____, carries more water than any other river in the world.
3.
3. Many species of birds migrate southward _____ colder weather arrives.
4.
4. _____ discovered by Marie Curie in 1898.
5.
5. The Great Wall of China stretches for thousands of kilometers, _____ one of the most impressive structures ever built.
6.
6. The cheetah can run faster than _____ animal on Earth.
7.
7. Scientists believe that dinosaurs became extinct _____ a massive asteroid struck Earth.
8.
8. _____ in the eighteenth century, the museum attracts millions of visitors each year.
9.
9. The invention of the printing press greatly increased the availability of books, _____ literacy rates throughout Europe.
10.
10. No country in South America produces _____ coffee than Brazil.
11.
11. The human brain contains billions of neurons, _____ communicate through electrical signals.
12.
12. _____ the invention of airplanes, long-distance travel was much more difficult.
13.
13. Mount Everest, _____ mountain in the world, attracts climbers from many countries.
14.
14. Coral reefs provide shelter for thousands of marine species and _____ coastlines from erosion.
15.
15. The Nobel Prize is awarded annually to individuals _____ have made outstanding contributions to humanity.
16.
16. The students (A) in the advanced class (B) was required (C) to submit their assignments (D) before Friday.
17.
17. Archaeologists have discovered (A) valuable artifacts that provide (B) important information about ancient civilizations (C) and their daily lifes (D).
18.
18. The professor encouraged (A) her students (B) completing (C) the research project before the end of the semester (D).
19.
19. The number of applicants (A) have increased significantly (B) since the university introduced (C) its new scholarship program (D).
20.
20. The library provides students with (A) access to thousands of books, journals, and (B) other valuable informations (C) for academic research (D).
21.
21. The manager requested (A) that every employee (B) submits the report (C) before leaving the office (D).
22.
22. The Amazon River is longer (A) than many other rivers, but some scientists believe it is more wide (B) than previously thought (C) in the world (D).
23.
23. Neither the teacher nor the students (A) was aware (B) of the changes (C) in the examination schedule (D).
24.
24. The report contains (A) fewer errors (B) than the previous version and is much (C) more easier to understand (D).
25.
25. The research findings (A) suggest that regular exercise (B) contribute significantly (C) to improving mental health (D).
26.
26. The committee (A) have decided (B) to postpone the meeting until additional information (C) becomes available (D).
27.
27. One of the most important factors (A) affecting (B) student performance are (C) the quality of instruction provided by teachers (D).
28.
28. The company plans (A) expanding (B) its operations into several new markets (C) next year (D).
29.
29. The scientist explained (A) the experiment carefully (B) so that the students could understand it (C) more easier (D).
30.
30. The museum contains (A) a large collection of artifacts (B) that dates back (C) to ancient civilizations (D).
31.
31. The manager insisted (A) that all reports (B) are submitted (C) before the end of the month (D).
32.
32. Researchers have discovered (A) that sleep plays a crucial role (B) in maintaining physical and mentally health (C) throughout (D) life.
33.
33. The new software allows users (A) creating (B) documents more efficiently and share (C) them online (D).
34.
34. Neither the employees nor the manager (A) were aware (B) of the problem until the customer (C) filed a complaint (D).
35.
35. The lecture was so interesting (A) that many students stay (B) after class to ask additional questions (C) about it (D).
36.
36. The Nile River is long (A) than most rivers (B) in Africa and has been an important source (C) of water for thousands of years (D).
37.
37. Many young people today (A) are interested in careers (B) that combines (C) technology with creativity (D).
38.
38. The number of international students (A) attending the university have increased (B) steadily (C)over the past decade because of scholarship programs (D).
39.
39. Successful leaders are often characterized (A) by their ability to communicate clearly (B), make effective decisions (C), and motivating others (D).
40.
40. Each of the participants (A) were given an opportunity (B) to express their opinions (C) during the discussion (D).
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