通常「上午」是指九點到中午，相當於late morning. 早上則指early,morning.

Could 早上 maybe be added?

Shouldn't "早上九点差一刻" work?

How long has this course been out, and the hover-over hints are still missing? I report it every time I see it, but I have yet to see a single one of my reports about these hints being wrong or missing, acted on.

Are any of the course contributors even checking the reports about the hover-over hints or are they focusing exclusively on the sentence translations?

I think it would improve the course significantly if there were better hover-over hints, especially in the earlier exercises or sections, ones likely to have the largest number of beginners practicing them repeatedly.

It's better to say 早上

給我用「 上午8點45分」 吧！ 哈哈

This should explain more, i still don't understand it

It needs to be 三刻 instead of 四十五分。