从下面每句划线部分中选出错误的那个部分,并加以改正。 小题1:My teacher advised me that I solve the problem by the way. 小题2: Both of her sons joined in the army two years ago . 小题3:I can hard wait to go on my trip to France . 小题4:I have been a friend of Mr White for long time . 小题5: No one else can stop you to making progress in your studies.