You are always making the same mistakes again and again.Now my patience was　　　 .

　 A.come to an end 　　　　　　　　 B.at an end

　 C.in the end 　　　　　　　　　　 D.at the end

When products made in factories _____, they are thrown away as garbage.

　　A. come to an end 　 B. are put to use 　 C. are used up　 D. wear out

When products made in factories _____, they are thrown away as garbage.

　 A. come to an end　 B. are put to use

　 C. are used up　　　 D. wear out

They may not ______ if you are so lazy.　

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A. come for helping you　　　B. come for your help

C. come to your help　　   　D. come to you for help

It is the first time that he ______ here and now it is high time that he ______ around.

　 A. come; should be shown　　　　　　　　　　　　 　　 B. has come; was shown　　 　　

C. came; was shown D. has come; be shown