I found ______ possible to answer all the questions within the given time.
| A．that | B．it | C．this | D．what |
He waited ________ the volcano became quiet and he was able to return two days later.
| A．when | B．before | C．as | D．until |
She worked hard ________ everything would be ready by the time he came back.
| A．since | B．so that | C．as if | D．unless |
________ he studies hard, he will never pass the examination.
| A．If | B．Unless | C．Even if | D．Even though |
I criticized him, you know, not ________ I hate him but ________ I love him.
| A．because; because | B．because; for | C．for; because | D．for; for |
I had no sooner got back to the kitchen ________ the door-bell rang loud enough to wake the dead.
| A．when | B．than | C．as | D．while |