[解析]
1.reviewed,考查时态,表示已发生的事情,所以用一般过去时态,故填reviewed.
2.his,考查形容词性物主代词,放在序数词前面,所以用形容词性物主代词,故填his.
3.Standing,考查现在分词,stand和句子主语之间是主动关系,所以用现在分词作状语,故填standing.
4.the,考查固定搭配,at the beginning期初,故填the.
5.slowly,考查副词,修饰动词,所以用副词,故填slowly.
6.flags,考查名词的数,flag为可数名词,所以用复数泛指,故填flags.
7.with,考查介词,表示"带着、有",后跟宾语,故填介词with.
8.played,考查过去分词,play和它所修饰的名词之间是被动关系,所以用过去分词作后置定语,故填played.
9.which,考查非限制性定语从句,先行词为 Chang'an Avenue,在非限制性定语从句中作主语,故填which引导.
10.when或while或as,考查连词,表示"当…的时候",句意为:当豪华轿车驶回天安门讲台时,习近平通过麦克风不断致敬,士兵们大声回应,故填when或while或as引导.