Is there a letter ______ a postcard ? There’s a letter.
Is there a letter ______ a postcard ? There’s a letter.
They are all new, ________ I’m not.
—It's dangerous here. We'd better go out quickly.
—But I think we should let ________ go out first.
Just search the Internet, you can get almost all the________ you need.
Some people ride bikes to work to reduce ________ pollution.
In the north of China, it is a (an) ________ to have dumplings in the Spring Festival.
—I have great ________ in learning physics and I'm so worried. Could you help me?
—Sure, I'd love to.
—What is Tony like? —He is helpful. He often gives people a ________ when they are in need.
—Finding information is not a big deal today.
—Well, the ________ is how we can tell whether the information is useful or not.
—I think the dragon is a ________ of China. Do you think so?
—I agree with you.