24.—John, don’t waste any time and there’s only 25 minutes left before the train leaves. —Don’t worry , mum. I think I can ____it.
________swallow(燕子)doesn’t make ________ summer.
--Did Mary come to your birthday party? --No. I __________ her, but she was away on business.
All the preparations_________, we're ready to start.
--Do you know when the Chinese custom_________ from? --It's hard to say. But its characteristics__________ the Tang Period.