_ _ busy schoolwork, the children also have to take arts, music and sports classes in their free time.
Many of us have a bad opinion of him, but he ____________ by his leaders.
--Mike’s bike didn’t work yesterday, so he didn’t go there with his deskmate. --He _________ mine. I wasn’t using it then.
The old professor, to_______ the important invention _______, decided not to keep it for himself, but to make it known to all over the world.
It remains ______ whether Liu Xiang will take part in the next Olympics.
I don’t think the problem you referred to is worth______.