(2013·河南豫西五校高三质检)In spite of all ________ has been said, quite a lot of people are still uncertain about the prices of housing in China.

I ________ the room yesterday, so it is not dirty today.

Why do you know so much detail about the accident? –I ________ a walk nearby when it happened

Lucy, is maths difficult to learn in a foreign school—I’m not sure, but no subject can be learned well __________hard work.

Is this red bag yours—No, it isn’t. is that black one.