17.

There are a lot of people here,  ?  

18.

Let's have dinner at 8:30,  ?  

19.

This movie isn't very interesting,  ?  

20.

I'm too fat,  ?

21.

Those aren't serious problems, ?   

22.

I shouldn't have gotten angry,  ?  

23.

Use your mobile phone outside,  ?  

24.

They had to go home,  ?