从下面每句划线部分中选出错误的那个部分，并加以改正。My teacher advisedme that I solve the problem by the way．
Both of her sons joined inthe army two years ago.
I can hard wait to goon my trip to France.
I have been a friend of Mr White forlong time．
No oneelse can stop you to making progress in your studies.
Dr. Black comes from either Oxford or Cambridge, I can’t remember where .
Life in the city is quite different from one in the country.
The mother didn’t know how to blame for the broken glass as it happened while she was out.
I 'd appreciate that if you would like to teach me how to use the computer.
Both teams were in hard training, either was willing to lose the game.