He made another wonderful discovery, ______ of great importance to science.
| A．which I think is | B．which I think it is |
| C．which I think it | D．I think is |
__________ caused the accident is still a complete mystery.
| A．What | B．That | C．How | D．Where |
__________that they found an unusual plant in the forest.
| A．It is said | B．They are said |
| C．It said | D．It says |
__________we can’t get seems better than__________we have.
| A．What；what | B．What；that |
| C．That；that | D．That；what |
—Do you still remember__________he was taken to the hospital?
—Yes，he was sent to the hospital in Mr Smith’s car.
| A．why | B．how | C．when | D．that |
__________beat Xiao Wang black and blue is not known.
| A．Whom | B．Whoever | C．Who | D．What |