(D)21.Alex and his classmates sent many old clothes and food to the people ________ need last Sunday.
A.of B.with C.at D.in
(B)22.________ I go to Mark's home,he is always sitting on the sofa,watching TV.
A.Although B.Whenever C.Since D.While
(B)23.—I want to get to know Bob.
—OK,let me ________ you to him.
A.accept B.introduce C.offer D.report