—Have you finished the book?
—No，I’ve read up to____ the children discover the secret cave.
A.which B.what C.that D.where
I really don’t know______Tom lost his wallet.
A.when was it that B that it was when
C. where it was that D. it was where that
Our class adviser doesn’t doubt，in any case.___.we can overcome the difficulties in our study.Healways gives us a confident smile.
A.how B.whether C.that D.why
It was never clear _______ the man hadn’t reported the accident sooner.
A.that B.how C.when D.why
Barbara Jones offers to her fans is honesty and hapiness.
A. Which B. What C. That D. Whom
It is uncertain____side effect the medicine will bring about，although about two thousand patients have taken it.
A.that B.what C.how D.whether
