I would have paid a visit to you _______ possible.[ ]

No one knows exactly when ourancestors started talking, but new evidence suggests that____ might havehappened a long time ago.

he nuclear crisis worsening in Iran,the world’s attention is fixed again on ________is called the Middle East

Whose advice do you think I should take–______.

“Where did you find the professor who made the speech yesterday?” “It was in the hall _________ the students often have a meeting.”