I will come back to see you next week if I am free.

Daily Mail of November 25th reported that American astronomers （天文学家）______aplanet that was most similar to the earth.

There is _____ international university in the city.

Is this your notebook? — No, it isn’t. Ask Bill. He is looking for _____.

.—Must I turn off the gas after cooking ? –Of course . You can never be ___ careful with that.