question: although this is theoretically possible, repeated washing of these often produces no improvement.
Capitalize this past sentence correctly.
A: Although this is theoretically possible, repeated washing of these often produces no improvement.

question: in the year 2010, the climate action discussion must remain highly-charged.
Capitalize this past sentence correctly.
A: In the year 2010, the climate action discussion must remain highly-charged.

question: monthly rentals 10 %
Capitalize this past sentence correctly.
A: Monthly rentals 10 %