_____ I entered, he was _____ in his book and didn’t notice me.
| A．When; devoted | B．While; absorbed |
| C．When, absorbed | D．While, devoted |
_____ when one loses freedom does one know its value.
| A．Just | B．Only | C．Even | D．Ever |
Little Jim is going to spend his holiday in Paris, _____ lives his uncle.
| A．which | B．who | C．where | D．that |
The problem is not _____ easy. Think _____ over.
| A．such, it | B．that, it | C．so,不填 | D．that，不填 |
It is so difficult a problem that _____ student in this class _____ work it out.
| A．any, can't | B．no, can | C．every, can | D．no, can't |
I think he is _____ to win, but I'm not sure.
| A．possible | B．likely | C．impossible | D．certain |