Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

48. Managers and workers in enclosed spaces are required to wear masks at all times.
A. Managers and workers in enclosed spaces must wear masks at all times.
B. Managers and workers in enclosed spaces needn't wear masks at all times.
C. Managers and workers in enclosed spaces can wear masks at all times.
D. Managers and workers in enclosed spaces may wear masks at all times.

49. "Do you find my hometown beautiful?" asked the singer.
A. The singer asked his audience if they find my hometown beautiful.
B. The sing asked his audience if they found my hometown beautiful.
C. The singer asked his audience if they found his hometown beautiful.
D. The singer asked his audience if did they find his hometown beautiful.

50. Swimmer Nguyen Thi Anh Vien last worked as an athlete in 2022.
A. Swimmer Nguyen Thi Anh Vier has been working as an athlete since 2022.
B. Swimmer Nguyen Thi Anh Vien worked as an athlete since 2022.
C. Swimmer Nguyen Thi Anh Vien hasn't worked as an athlete since 2022.
D. Swimmer Nguyen Thi Anh Vien didn't work as an athlete in 2022.