Senior three English fills in the blanks with a grammatical sentence, which is a bit difficult to analyze.

1. When introducing attributive clauses, the meanings of relative adverbs when, where and why are equivalent to the structure of "preposition +which" and are often used interchangeably with the structure of "preposition +which". 19 should be somewhere.

Sand (is transported) across the island. 20 is the predicate structure of the whole sentence, and according to the subject the sand, the predicate is transported.

3. The sentence already has a predicate component, so the push phrase can only be an adverbial clause with a non-predicate component. 2 1 should be pushing.

In dauphin island, the island is located about 90 miles east of the landslide caused by typhoon, and the sand that constitutes Yanzhou Island (that is, dauphin island, here is the geographical name) is transported to the land through the Mississippi Strait and across the island.