Our classroom _________ twice a day. So it is veryclean.–It is important for us to do this.

Thanks a lot for offering ________ advice to me in my research.— It was my great pleasure.

With a lot of homework to do this evening, Tom’s mother will allow him to watch TV ________[ ]

You didn’t believe John won the first prize at the speech competition, ______?

It is winter now. The weather in Nanjing is becoming .