Question

1. Maribeth and Dwight were careful as the walked ______
the high rock wall​

Answer 1

Maribeth and Dwight were careful as the walked by the high rock wall

Answer 2

Maribeth and Dwight were careful as they walked by the high rock wall.

Detailed answer

The word by is used to complete the sentence now the sentence is a proper sentence.

• The sentence now conveys that both of them were really careful while they were walking by the high wall.
• The sentence is now a grammatically correct sentence and conveys a meaning.
• The word by is a type of adverb that is used to connect a sentence.