1.    Sherlock Holmes had great powers of (observance observation).

2.    Did Bobby complete the (observance observation) at his high school? 

3.    Jane attended the bridal party, in (observance observation) with tradition.

4.    I have no talent for (observance observation); details always escape me.

5.    Using keen (observance observation), the hunter tracked down the deer.

6.    Do you follow the (observance observation) of Christmas?

7.    In (observance observation) with the new law, the man was detained for questioning.

8.    It takes skilled (observance observation) to work as a psychiatrist. 

9.    Larry followed the new (observance observation) in full effect to his supervisor's initiation.

10.    Because I  witnessed the fight, the police requested a record of my (observance observation).