Choose the word or phrase (A; B; C or D) that best completes the sentence.

48. I'll meet you ______ the supermarket _______ the fountain.
A. at - next to B. at - between C. behind - on D. in front of - in
49. Their family photographs are displayed ______ the wall.
A. above          B. under         C. in            D. on
50. She arrived _______ London _______ March 2023.
A. at - an        B. in - in          C. at - at          D. on - in