it 要放在up之前,look up 是个词组,it作为代词只能放在介词up之前,如果是名词的话就可以放在up后面或look up之间.
第二句consider后面接动词ing做考虑的意思,因为consider是个及物动词,他的用法为consider sb/sth (for/as sth)或者consider doing sth
3.If you don;t know the meaning of the word,you may look up
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