Without facts, a person can not form a correct opinion, for he needs to have actual knowledge ______his thinking .
A.on which to be based B.on which to base
C.which to be based D.which to base
A few minutes earlier, and you would have seen the NBA star. But you ______.
A.didn’t come B.don’t come C.haven’t come D.won’t come
He was told that it would be at least three more months _______he could recover and return to work.
A.when B.before C. since D. that
---Where did the accident happen?
---It was at the post office near the Mansion Friendship ______ the peace talk would be held.
A. where B.which C.that D. When
I dislike _________when others laugh at me in public or think poorly of me behind.
A.that B.those C.it D.them
________about her son’s future, the mother has been sleeping very badly these months.
A. Concerning B. Concerned C.To concern D. Having concerned
