In making a scientific experiment, one should not be _____ by temporary setbacks but should stick to doing it hopefully.
______, education is about learning and the more you learn, the more equipped for life you are.
I’m sorry I can’t help ____ the flowers, because I’m busy preparing for the singing competition ____ tomorrow.
The forest guards often find campfires that have not been ____ completely.
He said that light ____ much faster than sound.
–The house ____ fire and was destroyed.--Who ____ fire to the house?