31.   That night when I arrived home, my wife sniffed the air.

32.   They sniff the air and scurry off in a new direction, quickly finding mounds and mounds of even better cheese.

33.   Upon arrival, she sniffed the air.

34.   As the decontamination occurs, the EPA laboratory bus will sniff the air around the building through vents in the roof or side.

35.   She sniffs the air to check if it will rain.

36.   When family groups heard the sounds of strangers, they tended to bunch together defensively and raise their trunks to sniff the air.