He turned to Russia for help in the belief ______ the country would protect him.
| A．what | B．whether | C．that | D．because |
Some researchers believe that there is no doubt ______ a cure for AIDS will be found.
| A．which |
| B．that |
| C．what |
| D．whether |
The old lady’s hand shook frequently.She explained to her doctor ______ this shaking had begun half a year before, and, ______ only because of this, she had been forced to give up her job.
| A．when;how |
| B．how;when |
| C．how;how |
| D．why;why |
_______ in the regulations that you should not tell other people the password of your e-mail account.
| A．What is required |
| B．What requires |
| C．It is required |
| D．It requires |
Along with the letter was his promise _______ he would visit me this coming Christmas.
| A．which |
| B．that |
| C．what |
| D．whether |
The poor young man is ready to accept ______ help he can get.
| A．whichever |
| B．however |
| C．whatever |
| D．whenever |