It turned out that one of the children I thought a girl was _______ a boy.
Naturally a smile ________ the eyes participate is extremely communicative.
With hundreds of attractions, Beijing is a city ________ makes a lasting impression on its visitors.
Just use this room for the time being, and we'll offer you a larger one ________ it becomes available.
Everything was placed exactly ________ it used to be before she left the laboratory.
________ I'm mistaken, I've seen that tall man at a party before.