A salty diet may increase the risk of stomach cancer ________ 10 percent, South Korean researchers found in a study of more than 2 million people．
| A．at | B．to | C．by | D．for |
She will fly to Washington, ________ she can enjoy herself.
| A．that | B．which | C．where | D．/ |
These experiences ______ me _____ the drug’s harmful effects.
| A．are convinced; by | B．convinced; of | C．were convinced; by | D．convinced; at |
— Did Alan enjoy seeing his old friends yesterday?
— Yes, he did. He _____ his old friends for a long time.
| A．didn’t see | B．wouldn’t see | C．hasn’t seen | D．hadn’t seen |
— Have you handed in your schoolwork yet?
— Yes, I have. I guess it ______ now.
| A．has graded | B． is graded | C． is being graded | D． is grading |
At the end of the meeting, it was announced that an agreement ______.
| A．has been reached | B．had been reached | C．has reached | D．had reached |