Sarah looked at ______finished painting with ________satisfaction.
| A．/；a | B．a；the | C．the；/ | D．the；a |
He ________ the exam, but he was too careless.
| A．could have passed | B．couldn’t have passed |
| C．must have passed | D．may have passed |
These chairs may look good, but they’re very un-comfortable _____.
| A．to sit on | B．to be sat on | C．sit on | D．sitting on |
Do you prefer_____when your boss takes an interest in your personal life?
| A．this | B．不填 | C．that | D．it |
When the clock ________ 11, I was about to leave for the supermarket.
| A．knocked | B．hit | C．beat | D．struck |
Famous physicists from all over the world came to the US to ______the 100th anniversary of Albert Einstein’s birth.
| A．congratulate | B．celebrate | C．applaud | D．participate |