"Close the window."
Translation:E pani i ka puka aniani.
I think we understand that "'oe" is optional here, but that is not the only point. This is a beta program looking for bugs; in a live language class, ANY correct answer is acceptable. In this beta, sometimes we are marked "wrong" for including "'oe," and at other times we are marked "wrong" for excluding it, depending on the answer chosen by the preparer. Both answers should be technically correct, with perhaps a suggestion as to the "more correct" answer and the reasons why. As this issue occurs with many Q&A, hopefully the bug will be fixed for smoother sailing.