Read the following passage and mark the letter A, B, C or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks

Since March 16 when the public schools were closed, about 1.800 schools across the city tried to adjust to distance learning - a present situation (16) _______ turned not less than a mi parents into temporary teachers and changing the relationship between school kids, (17) _______ students, parents, and teachers in New York City, the largest school district US.

This unexpected adjustment has posed a serious challenge to teachers and educators on how (18) _______ the individual needs of the students. Mr. de Blasio said that the teachers' ability abruptly switch to distance learning would be remembered as one of the “heroic achievements of the coronavirus outbreak. If the schools remain closed in New York City up to that time, it would be a grave (19) _______ for the most disrupting moment to US education in a generation.

Mr. Bill de Blasio who claimed sole responsibility to the public school kids, along with schools' chancellor, Richard A. Carranza, disclosed that city was preparing to resume public school activities by the next academic year, scheduled in September.

He further said the expected the turn of new education era in New York City would go with the support for school kids to catch up on lost time in classroom teaching and learning (20) _______ supportive efforts may come too late for the graduating high school seniors.