Select the most appropriate option for blank no. 2.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. believe.
- The sentence is describing the viewpoint or belief of some experts regarding why animals may be able to detect or sense the earth's vibrations.
- In this context, the verb "believe" is used to express the experts' opinion or point of view.
- The word "believe" is in the present tense to indicate that this is a general belief held by these experts.
- Believing" is a present participle and does not work as the main verb in this context.
- "Believed" is in the past tense and would suggest that the belief was held in the past, which is not the intended meaning in the sentence.