．To deal with the global financial crisis, China ______ the international community to help developing countries．
| A．called on | B．called up | C．called in | D．called for |
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 |
________ you understand this rule, you’ll have no further difficulty.
| A．Once | B．Unless | C．As | D．Until |