He promised to come early, but he didn’t _____ until 10 p.m.
| A．turn down | B．turn off | C．turn in | D．turn up |
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 |