In the Olympic Games, only athletes who have reached the agreed standard for their ____ will be allowed as competitors.
This morning Tom got up ealier ___ be late for school.
I have only one uncle, ____ I can turn to for help.
From the ___ expression on her face, we knew that the problem was ____.
The firemen arrived ___ the fire broke out.
This is the second letter that he has ___ him recently.