—Have you read the book called Waiting for Anya?—Who _________ it? 

I would have come sooner but I ________ that they were waiting. 

Lin Tao has returned from the UK recently. He ______ at Cambridge for four years, during which we ______ with each other on the Internet.

 The problem with people in Africa ____that the more is given and the more ______.

—Someone has tidied the sitting room!—Jim __ it this morning; he couldn't bear the mess any more．