18.The students want this examination.

1. pass
2. passed
3. to pass
4. passing

19. They glasses of water. They want.

1. want, drink
2. want, drank
3. want, to drink
4. wants, to drink

The phrase “the students want this examination” implies that they are looking forward to successfully completing or taking it. In context, the infinitive “to pass” works perfectly here, as it expresses their desire or intent. Hence, the correct option is 3) to pass, creating a positive affirmation of ambition and goal-setting in educational pursuits.

Similarly, the sentence construction in the second example showcases a desire linked to an action. Here, the students express their interest in drinking, which aligns with the use of the infinitive form. Therefore, “They want to drink glasses of water” is the correct formulation, making option 3) want, to drink the ideal choice. This shows the importance of combining desires with actions in clear communication.