Their carelessness ______ the failure. That is to say, the failure_____ their carelessness.

When she heard from the hospital that her father had died, she _____ into tears.

 The authorities will____ the case further before they can come to a conclusion about it .

After a long time’s hard work, he _________ Qinghua University last year.

John speaks English ___________, if not better than, David.