ear-old teenager from Guangdong nicknamed Niko demanded an apology from Youku, which he believed violated their copyrights as it used his team’s photos without ______.

I can’t find_______ pen. Can you help _______

ars, it was viewed as a serious problem,________ that has never been really solved.

Is this the reason ___ at the meeting for his carelessness in his work?

The teacher apologized_______late．