It is a pity that the industrial cities _____ in the nineteenth century do not attract visitors.
_________, 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 ___.
Has someone suggested there _______ be an international language all could understand and use ______? A can; it B /;/ C would; it D may;/