Our teacher insisted that the keywords worth paying attention _______ before class

She worried ________ her child would be hurt

She is very good at painting. She can paint _______her teacher.

_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate

When I was in hospital, my mother promised me that she would take me to Qingdao ________ I was well enough to travels, which ________ my recovery. [ ]