Traffic conditions in Beijing ________ for decades. At first people only complained about jams during rush hours，but today every hour is rush hour.
| A．is worsening | B．have worsened |
| C．worsened | D．have been worsening |
I ______ have worried before I came to the new school, for my classmates here are very friendly to me.
| A．mightn’t | B．mustn’t |
| C．needn’t | D．couldn’t |
Jane can’t attend the meeting at 3 o’clock this afternoon because she ______ a class at that time.
| A．will teach | B．would teach |
| C．has taught | D．will be teaching |
______in painting, John didn’t notice evening approaching.
| A．To absorb | B．To be absorbed |
| C．Absorbed | D．Absorbing |
-Jack, you seem excited.
-? I won the first prize in the English speech contest.
| A． | Guess what | B． | So what |
| C． | Pardon me | D． | Who cares |
Only when Lily walked into the office ______ that she had left the contract at home.
| A．she realized | B．has she realized |
| C．she has realized | D．did she realize |