Eating too much fat can _________ heart disease and cause high blood pressure.
| A．result from | B．contribute to | C．attend to | D．devote to |
— May I go and play football with Dick this afternoon, Dad?
— No, you can’t go out ________ your work is being done.
| A．before | B．until | C．as | D．after |
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 |