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
The other day，my friend John drove his car down the street at _______I thought was a dangerous speed and surprised everyone in the car.
A.which，that B.which，it C.as，which D.what，that
