We don't know ______，but it tells us the importance of friendship．（ ）
A．what the story is about
B．whether the story is true
C．when did the story take place
I'm so sorry for coming late again, Mr． Lee． But I don't do it on purpose．
______． But I advise you to be on time from now on．（ ）
A．You are so awful to do that．
B．I don't want to listen to you．
C．Never mind．
Chris, the West Lake is so attractive!
Yeah, the West Lake is the most beautiful place______I have ever visited．（ ）
A．whatB．whoC．that
I never see Linda take a taxi to work．
To live a low-carbon life, she always goes to work ______ her bike instead of______taxi．（ ）
A．by；byB．on；byC．on；in
Zhang Fuqing,once a soldier,often thinks more about others than himself．
______．（ ）
A．So he doesB．So does heC．So he is
Tony, do you think our city is becoming more and more beautiful？
Yes, especially after so many trees ______ last year．（ ）
A．are plantedB．have been planted
C．were planted