The word that fits the sentence is AL.
There you go.
El sábado pasado caminé hasta la casa de mi abuelita porque no encontré un taxi.
The speaker is saying this whole thing happened last Sunday, meaning the verb should be in past tense. Also, the speaker says they didn't find a taxi. Someone who didn't find a taxi is likely to walk to their destination instead. So, we can assume the blank is caminé.
Question 4. Los libros rojos
Question 5. Le
Question 6. Les gusta
Answer: The sentence in the correct present tense would be Las chicas estan sacando la basura de la Cocina.
Hope this helps.
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