The old professor, to_______ the important invention _______, decided not to keep it for himself, but to make it known to all over the world.
Don’t make ______ of her. Can’t you see she is in ______?
The long-lasting meeting, filled with arguments and quarrels, ended in disorder, ______ no conclusion.
Time should be made good use ______ out lessons well.
.Which do you enjoy ______ your weekend, fishing or staying at home?
We should prevent pollution ______ happily.