Researchers have found clear and convincing evidence ________ happiness is the key to better health and longer lives.
| A．where | B．whether | C．how | D．that |
______ I already know what career I want to follow.
| A．Young as I am | B．I am as young |
| C．As I am young | D．As young I am |
_______ makes the book so extraordinary is the creative imagination of the writer.
| A．That | B．What | C．Who | D．Which |
I can’t remember _______ you started doing the work.
| A．that it was when | B．when it was that |
| C．when was it that | D．that was it when |
In order to have _____ better understanding of the accident, the three witnesses were called for _____ second meeting．
| A．a; a | B．the; a | C．a; 不填 | D．不填; the |
The human body consists of organs, each ____a definite job to do.
| A．Have | B．to have | C．Has | D．having |