The schools themselves admit that not all children will successful in the jobs ______ they are being trained.
His lack of professional knowledge _______for the failure of the experiment.
Not believing their eyes, the visitors on the spot _______ the flying plane, doing some most difficult and dangerous tricks in the sky.
Many festivals are held _______ our ancestors for their contribution to the world.
She promised to ______ at the meeting but she didn’t ______.
In order to win back the customers, the owner of the restaurant decided to sell his food ____.