The picture ____ on the wall is painted by my nephew.
It’s _______ that you’ve got a headache; you drank too much last night.
---I can’t work it out in this way. ---Why not ________ it another way?
The _______ performance ________ everyone present.
The course will give a general introduction, _________, it also provides practical experience.
_______ many times, but he still couldn’t understand it.