Some of the exercises appear to be ___ ones that you have done, but after taking ___ second look, you will find that they are different.
From what she has done we can predict that she is ______enough to make up her own decision and behave in a proper way.
Never______ such a difficult problem. It took me almost half an hour to work it out.
— Do you remember the first time we met?—At that time you ______us a lecture.
Your _______ as a student will be excellent if you develop a habit of reflecting on how you learn.
The scientists are beating their brains, trying to ______ a solution to the problem.