Zhao Benshan，whose overwork ________ his health failure，is said to have performed in．the Spring Festival Gala on CCTV in 2011．
| A．contributed to | B．appealed to | C．applied to | D．owed to |
The customer bargained with the shopkeeper for a long time, and finally they agreed ___________ the price.
| A．to | B．with | C．on | D．at |
Having received___________ training of the MS. Company, he was offered important position in management.
| A．the;an | B．不填;an | C．the;不填 | D．a;a |
He must have attended the meeting yesterday,___________ he?
| A．didn't | B．mustn't | C．needn't | D．hasn't |
I was really too busy with my homework and I couldn't help ____________
housework.
| A．doing | B．do | C．did | D．done |
Mary is one of the brightest students who_________ from New York University.
| A．is graduated | B．have graduated |
| C．has graduated | D．are graduated |