He has worked __________ the maths problem for nearly an hour but he simply can't work it __________.
—Does he work hard at his lessons? —Yes, he ________ no effort, as far as I know.
A smile ________ the mother's face when the son walked onto the platform to receive the prize.
The sale of the company's new product is good. It has ________ two million dollars so far.
—Jack, this is the third time that you have been late this week. —Sorry, sir, but I was ________ for 15 minutes on the way here in the traffic jam.
Robert has rich work experience, so it will ________ for his lack of academic knowledge.