(2013·高考天津卷)At our factory there are a few machines similar to ________ described in this magazine.

---Is this book interesting? ---Yes, but I’m sure it won’t interest __________.

The manager decided to give the job to ________ who he believed had a strong sense of duty. 

The population of China is larger than ______ of the United States.

---- Who knocked at the door?  ---- I’ve no idea. I just pretended nobody was at home, so I didn’t ask who was___.