根据句意和汉语注释，在空格内写出各单词的正确形式。
【小题1】After watching such boring advertisements (广告), she felt very bored and turned off the TV.
【小题2】The sunny boy I know is the most humorous (幽默)in his class.
【小题3】The coaches (长途汽车)over there look very crowded. Shall we take a taxi instead?
【小题4】The boy looked so nervously (紧张)at the teacher that he could say nothing.
【小题5】The food cooked by his mother always tastes (尝)rather good, doesn't it?
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解析：
【小题1】句意：看了无此无聊的广告后，结合语境可知不是一则广告，故填复数名词advertisements 。
【小题2】结合下文in his class 在他的班内，可知填形容词的最高级the most humorous作表语，注意多音节形容词变最高级是通过在前面加most构成，并且不要忘了最高级前加定冠词the。
【小题3】根据谓语动词look可知主语是复数形式，故填复数名词coaches 。
【小题4】根据下文介词at可知本句中look是实意动词，看着的意思，联系前文如此so，可知填副词nervously 。这个男孩如此紧张的看着老师，一句话都说不出来。
【小题5】根据频度副词always可知本句为一般现在时态，cooked by his mother 为过去分词作后置定语。故谓语动词用一般现在时态单数形式，填tastes。