1.No matter how hard I worked, it seemed that I couldn't sovlve this maths problem.
2.Although we have not seen each other many years, but he has not changed as if.
3.Successeful lecture calls for such as postures, hand signal, and timing control etc.non- language exchange.
4.Before attending the party, please make sure the gift must suit for the master's family.
5.We did not know how can distract the pain his son's dying which brings to her.
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