Fill in the blank with the correct form of the verb to complete the following sentence: The popular belief is that it is an endless stretch ofsand where no rain _______(fall) and, therefore no vegetation grows.

The correct answer is C. falls.

The sentence is in the present tense, so the verb must also be in the present tense. The other options are in the past tense (A), the progressive tense (B), or the plural form (D).

The sentence is about a general belief, so it is not specific to any particular time. The progressive tense is used to describe actions that are happening at the moment or that are happening over a period of time. The plural form is used to describe more than one thing.

In this case, the popular belief is that it is an endless stretch of sand where no rain falls. This is a general belief that is not specific to any particular time. Therefore, the correct verb form is falls.