根据所给的句子以及汉语释义，用所学过的单词或短语完成句子，每空一词。
【小题1】 (直到现在)，we have finished Book 4.
【小题2】We are not allowed to (参考)our notes in the exam.
【小题3】His laziness can perfectly (为…做出解释) his failure.
【小题4】No one knows exactly how the fire （爆发）last night.
【小题5】Women are still being （看不起）in some areas.
【小题6】 It was hard for him to (挑出)his teacher in the crowd.
【小题7】Keep on working like this and you will succeed (迟早).
【小题8】 I know (据我所知)，he is from America.
【小题9】They (屏住呼吸) and watched the cat closely.
【小题10】With so many animals (灭绝)，the environment is being worse and worse.Up to now
网友回答
(答案→)Up to now
解析：
【小题1】Up to now 固定词组:直到现在up to now
【小题2】refer to 固定词组：参考；查阅；涉及；refer to
【小题3】account for 固定词组：解释account for
【小题4】broke out 固定词组：爆炸；break out;本句是过去时。
【小题5】looked down upon/on 固定词组：看不起look down on/upon
【小题6】pick out 固定词组：挑出pick out
【小题7】in time 固定词组：及时in time
【小题8】As far as 固定句型：as far as I know据我所知
【小题9】held their breath 固定词组：屏住呼吸hold one’s breath。根据watched说明本句使用过去时。
【小题10】dying out 固定词组:灭绝die out；本句是with复合结构，与animals构成主动关系，故使用现在分词的形式。