Liu Xiang’s breaking the world record was an exciting moment, _______all of us will never forget.

下列交际用语使用得体的一项是（ ）

______ do you usually do at weekends, Susan — I usually help my parents do some housework.

_________ useful dictionary it is!’— ‘I think so.’

Her father didn’t ask her to do it, but he didn’t ask her not to do it,______.