How long has Eliza been a nurse—___________.

____is well-known to all, the great changes have taken place in China.

The terrible accident might not have happened had thedriver been more careful.–But he _____.

I expected Mark ________his talents in the competition, but he didn’t appear.

You didn’t go to Europe, why? —I _____ this morning, but I _____ to Shanghai because of an emergency