【小题1】This summit produced a breakthrough (突破) in the relations between the two countries.【

【小题1】This summit produced a breakthrough (突破) in the relations between the two countries.
【小题2】It looks perfect (完美的) on you.
【小题3】Science fiction (小说) is often about things that we believe may be possible in the far future.
【小题4】 Oil has a density lower than 1000 kg/m3,so it will float (漂浮) on water.
【小题5】They are famous as the freedom (自由) fighters.
【小题6】The plane is now flying at an altitude (海拔，高度) of 30,000 feet.
【小题7】 The last day of Kwanzaa is marked by a feast （盛宴）, where a lot of people enjoy a big meal.
【小题8】Segregation eventually disappeared and a new dawn (黎明)seemed to arrive.
【小题9】The pains of slaves were brought from Africa by greedy (贪婪的) slave traders.
【小题10】The police arrested (逮捕) a black woman who refused to give her seat to a white man.

解析：【小题1】 作宾语，故需要用名词形式【小题2】look是系动词，故需要用形容词作表语【小题3】这里作主语，故用名词形式【小题4】情态动词之后用动词原形【小题5】freedom fighters是专有名词，意思是自由战士【小题6】冠词之后应该用名词【小题7】冠词之后应该用名词【小题8】这里and连接了两个并列句，and之后的句子，空格处作句子的主语，故用名词形式【小题9】需要用形容词修饰名词【小题10】定语从句中who refused to give her seat to a white man.用的是一般过去时，可判断出这是发生在过去的事，故用一般过去时。

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