(2014·南昌第二中学高三检测)We must keep our room clean，for dirt and disease go________，you know

I have great __ inlearning math and I’m so worried. Could you help me? — Sure.I’d be glad to.

C________ of its body.

He made another wonderful discovery, ____ of great importance to science.

________ me what you wanted to know, I should not have wasted my time talking so much with you.