2. Plants need sunlight and water to ___ .

3. A ___ is a scientist who studies the stars and planets.

4. The ___ protects the body from illness and infection.

5. To ___ means to make something new or original.

6. A ___ is a place where you can see wildlife in its natural habitat.

7. The ___ is the part of the plant that grows underground.

8. In the past, people used ___ to send messages over long distances quickly.

9. A ___ is a large natural stream of water flowing in a channel to the sea, a lake, or another such stream.

10. The process of changing a liquid into a gas is called ___ .

11. An ___ is a person who designs buildings and often supervises their construction.

12. ___ is the study of past events, particularly in human affairs.

13. The ___ is an organ in the body that filters blood.

14. To ___ means to examine similarities and differences.

15. A ___ is a drawing or plan that shows the details of how something works or is put together.

16. She ___ (to be) excited about the trip next week.

17. They ___ (not to play) outside because it was raining.

19. He ___ (to want) to become a doctor since he was a child.

20. I ___ (to have) dinner at 7 PM yesterday.

21. You ___ (to need) to finish your homework before going out.

22. She ___ (to make) a cake for her birthday every year.

23. They ___ (to go) to the beach last summer.

24. It ___ (to rain) a lot in the spring.

25. We ___ (to be) friends for over ten years.

26. The flowers ___ (to bloom) beautifully in May.

28. You ___ (to forget) your book at home.

30. I ___ (to want) to visit France next year.

32. She ___ (to teach) English for five years.

33. We ___ (to plan) our vacation right now.

34. The museum ___ (to be) closed on Mondays.

35. He ___ (to have) a big breakfast this morning.

36. You ___ (to be) late if you don't hurry.

37. She ___ (to not believe) in ghosts.

38. They ___ (to find) a lost kitten outside their door.

39. I ___ (to think) about changing my job.

40. The sun ___ (to set) in the west.

1. The ___ is a tool used for cutting paper.

2. The ___ system is responsible for breathing.

3. To ___ means to make something known publicly.

4. A ___ is a person who writes for newspapers or magazines.

5. The Earth rotates on its ___.

6. ___ is the science that deals with the study of the universe.

7. She is interested in studying ___ to learn about past cultures.

8. The ___ is a period of ten years.

9. A ___ is a large, printed picture or notice put on a wall.

10. The ___ is the organ in your body where digestion of food occurs.

11. To ___ means to provide education or knowledge through instruction.

12. A ___ is an electronic device that can store, retrieve, and process data.

13. The process by which plants make their food using sunlight is called ___.

14. A ___ is a natural disaster involving a large wave caused by an underwater earthquake.

15. The ___ is a part of a plant that is often brightly colored and has a pleasant smell.

16. They ___ (to go) to the museum last weekend.

17. She ___ (to have) a great interest in science since she was young.

18. The students ___ (to write) essays on global warming tomorrow.

19. We ___ (to be) friends for more than five years.

20. He ___ (to not finish) his homework yet.

21. I ___ (to visit) my grandparents next month.

22. You ___ (to need) to study harder to pass the exam.

23. They ___ (to play) soccer every Thursday.

26. It ___ (to rain) when we left the house.

27. We ___ (to be) very tired after the long journey.

28. He ___ (to not believe) in ghosts.

29. I ___ (to think) of going to graduate school.

30. They ___ (to find) a lost dog in their backyard yesterday.

31. The ___ is a device that uses lenses to make distant objects appear closer and clearer.

32. The ___ is the layer of the Earth's atmosphere that contains a high concentration of ions.

33. A ___ is a long piece of writing on a particular subject, especially one done by students.

34. The ___ is a process by which green plants synthesize foods from carbon dioxide and water.

35. A ___ is a large area of salt water smaller than an ocean, often partly enclosed by land.

36. The ___ is a system of government by the whole population or all the eligible members of a state.

37. The ___ is a small book with blank or ruled pages for writing notes in.

38. ___ is the treatment of illness and injuries by trained medical professionals.

39. The ___ is the natural satellite of the Earth, visible by reflected light from the sun.

40. ___ is the art of making two- or three-dimensional representative or abstract forms.