1.   I checked the clock, squinting through bleary eyes.

2.   Officials from Greenwich Observatory have the clock checked twice a day.

3.   And his eyes rolled skyward only to check the clock, not to signal the tragedy of it all.

4.   And they are not checking the clock for midnight.

5.   Check your clock.

6.   Check the clock.

7.   Doctors in at least one major New York City hospital declined an invitation to check their clocks, even in the interest of science.

8.   I was just checking the clock.

9.   I remember checking the clock.

10.   No need to check a clock.