you ____________ doing something orhaving something, you must do it or have it

下列各句中，没有语病的一项是（ ）

Graduation is a good time tothank those who have helped you ______ the tough years.

Will you be able to finish the reportbefore Friday —I can’t ________ anything, but I’ll try mybest.

下列各句中，加点的成语使用恰当的一项是（ ）