—What’s that noise, John?—Sorry, Linda.I forgot to tell you.The school library ______.
----- In recent years,___ problem of global warning has been very serious. ------That’s right. People are facing ____ number of natural disasters now.
The generation _____ makes it difficult for parents to understand their children's opinions.
With sufficient scientific information a manned trip to Mars should be _____.
_____ inviting guests and not treating them properly!
_____ it is a good thing I did not get the post I had applied for, though I must admit that I was disappointed at the time.