1.I have many books,some of __________ are on chemistry.
A.them B.that C.which D.those
2.They were interested __________ you told them.
A.in which B.in that C.all that D.in everything
3.The astronaut did many experiments in the spaceship,__________ much help for knowing space.
A.which we think it is B.which we think are of
C.of which we think is D.I think which is of
4.The great day we looked forward to __________ at last.
A.come B.came C.coming D.comes
5.I like the second football match __________ was held last week.
A.which B.who C.that D./