Question 1: In future cities, solar panels on rooftops should be used to power skyscrapers

 -> It is necessary = should

Question 2: You shouldn't live live in this mega city because it is noisy and polluted.

 -> It's not good for sb = shouldn't

Question 3: A lack of housing affordability has made people move from the city since 2020

 -> started + mốc thời gian (QKD) = since + mốc thời gian (HTHT)

Question 4: New advancements in technology started widening the gap between children and adults a few decades ago

  -> for + khoảng thời gian (HTHT) = khoảng thời gian + ago (QKD)

Question 5: Many people started to exercise less at the time the pandemic began.

  -> since + mốc thời gian (HTHT) = started + mốc thời gian (QKD)

Question 6: This soup has a good smell