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1. D. so can

 `-` Cấu trúc: So + trợ động từ + chủ ngữ = ...cũng vậy 

`=>` John can speak Vietnamese and so can his sister Jane.

2. C. look up

 `-` look up là: tra cứu

 `-` Mấy từ kia không phù hợp

`=>` You should have a dictionary to look up the words that you don't know their meanings.