The twins looked exactly the same.Even I couldn't ___ one from the other.

A. speak   B. talk    C. say     D.tell

it's cold here. You’d better __ your clothes.

A. not put on   B. take off   C to put on   D. not take off

When I was walking in the street, I heard my name ___.

A. to call   B. calling   C. call    D. called