题目内容：

英语词形变化记忆
call\_all\_all\_ _all\_all\_all
cold\_old\_old\_old\_old
eat\_eat\_eat\ea_t\_ea_t
sea\_ea\_ea_\_ _ea_\ea_ _
low\_low\_low_ _\_low
cow\_cow\_cow\_ow_
feet\_eet\_eet_ _ _\_ _ _eet
sweep\s_eep\s_eep\_eep
ill\_ill\_ill\_ill\_ _ill
it\_it\_it\_it\_it\_it_ _ _
cat\_at\_at\_at\_at\_ _at
ate\_ate\_ate\_ate\_ _ate
noon\_oon\_oon\_ _oon
an\_an\_an\an_\an_\_an_
lay\_ay\_ay\_ay\_ay\_ _ay
yard\_ard\_ard\ar_\_ _ar_
dish\_ish\_ _ _ish