Choose the correct option to complete the sentence

mn giúp mik với ạ
----- Nội dung ảnh -----
17. We live at ________ third house from the church.
A. the B. a C. an D. x

18. My aunt has ________ interesting novel.
A. the B. a C. an D. x

19. It was ________ best film I had ever read.
A. the B. an C. a D. x

20. A video lab is ________ useful means for language learning.
A. the B. an C. a D. x