27. As five children under 10 got drowned in a southern province, it is not socially _____ for parents to leave children unattended at that age.
What he said was of ________.
_________, the subject belongs to biology.
_____seems _______something unusual in his eyes.
When I come in, I found a strange girl ______in the corner.
The girl looked at me with a ____expression. Maybe the problem was quite ___.