15. With the development of West China, many technicians are _____ needed there in recent years.
---Did you listen to the speech?--- No, we ______ it. But we had a lot of traffic on our way.
. Many people are still in _____ habit of writing silly things in _____ public places.
--- We really enjoyed ourselves at the party. Thanks again, Mr and Mrs Johnson.---____. Just drop in whenever you feel like it.
Cold as the weather was, our trip there _____ to be great fun.
--- Have a nice weekend!---Yes._____.