1.Without fact,we can't form a worthwhile opinion for we need to have factual knowledge ______ our thinking.
A.which to base on
B.which to be base on
C.upon which to base
D.with which to base on
2.We have all expreienced occasions ______ we have spoken our minds to someone,telling them exactly what we feel.
A.where
B.which
C.that
D.when
3.Tom comes to school by car every day,______ do many other teachers who live in the suburban areas of Chendu.
A.which
B.as
C.when
D.though