listen to the material carefully,although it is difficult and sometime you can't write down the correct answer.As long as you have tried,whatever you write down will be the harvest of yours.You should believe that only by accumulating little by little could you learn English welll.so come on.
The small van packed with explosives was driven into a checkpoint jointly manned by the Afghan army and American troops. According to one eyewitness, the wall of a mud compound then collapsed, ______________________. This attack brings to almost 700 the number of foreign troops killed so far in 2010, by far the bloodiest year in the nine-year campaign by international forces in Afghanistan.