We may meet all kinds of difficulties in the future， but we should be confident enough to any challenge.

Did they attend the opening ceremony? —They _, but they were late and quit it.

We_______onthis project for four hours Let’s have a rest

It’s 7:30. I can’t believe you___ cooking dinner yet, Sally.[ ]

下列加横线的字解释错误的一项是（ ）