Cancer has become the top killer ________ I think threatens the health of millions of people.
A.that B.of which C.不填 D.Both A and C
The mother saw her baby fall to the ground, ________ brought her heart to her mouth.
A.it B.and that C.and which D.that
More and more people prefer jogging in the morning, _______ benefits for health arise from the air rich in oxygen.
A.which B.that C.whose D.who
There are lots of places of interest _____ in our city.
A.needs repairing B.needing repaired C.needed repairing D.needing to be repaired
The book was written in 1946, ____ the education system has witnessed great changes.
A.when B.during which C.since then D.since when
I have never been to London, but it is the place ________.
A.where I would like to visit B.I most want to visit
C.in which I want to visit D.that I want to visit it most
