Karen was always thinking we were talking about his poor past. Every time we were chatting together, he would be all _____. 

______ that the way people spend their holidays has changed a great deal in the past ten years.

There is no doubt _____ China has made rapid progress in space exploration.

I had _________ entered the classroom when I noticed the headmaster was sitting at the back.

 ________him that she would fail as she was so able and worked so hard.