---- You’re always working. Come on, let’s go shopping.  -         -- - you ever want to do is going shopping. 

. --- Sarah said she wrote you a letter. --- I wonder ______ she is writing to me about.

The doctor thought ____ would be good for you to have a holiday.

 —Is ______ here? ---No, Tom isn’t here. But it’s time to have class.

The case of Li Gang became a hot topic and so did ______of Li Tianyi.