We watched the rock __________ in the pond. ()
A. requested
B. operator
C. customers
D. sink
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The store held a special sale for its regular __________. ()
A. sink
B. services
C. alive
D. customers
He __________ to stay up all night, but he fell asleep. ()
A. automated
B. tried
C. service
D. trying
We needed the __________ of an auto mechanic. ()
A. alive
B. try
C. service
D. services
I called the __________ to see if I could get Aunt Lucy's telephone number. ()
A. request
B. sink
C. services
D. operator