David may wonder ______ yellow was the colour of rulers in ancient China.

，where is mykey— ______________! You will find it sooner or later．

Occasions are quite rare ____I have the time to spend a day with my kids.

When I see you, the world stops ____ the only purpose in life was for me to please you

Why were you late for school today?—-It was ________ I help catch a thief on the bus