It took a long time for the connection between body temperature and illness ___________.
—I really don’t know when we can get over all the troubles. — ______! Our troubles will soon be over.
Our parents and teachers often ________ the importance of study hard _______ us.
Mr. Smith was the only one of those who ________ to the dinner.
I want to catch _____ early train, but couldn’t get _____ ride to the station.
Sitting alone by the window, all the memories __________ .