BUMPING

CAMPING

CHOPPING

CLAPPING

CREEPING

DEVELOPING

DRIPPING

DROPPING

ESCAPING

FLAPPING

GALLOPING

GROUPING

HAPPINESS

HELPING

HOPING

JUMPING

KEEPING

LEAPING

OPINIONS

PEEPING

PINCHED

PINNED

PUMPING

SHIPPING

SHOPPING

SKIPPING

SLEEPING

SLIPPING

SLOPING

SNAPPING

SPINNING

STAMPING

STEPPING

STOPPING

SWEEPING

TAPPING

TIPPING

TRAPPING

TRIPPING

WIPING

WRAPPING

Solution on page 370