—Dad, there is something wrong _____ my computer. I can’t get on the Internet.—Why? Let me have a look. Oh, it’s wrong _____ you to click a wrong icon.
_______ homework, we do their homework on Sunday.
---How often are the Olympic Games held? ---_____four years.
The ice isn’t ______________ to skate on.
---Are you going to ____________ your friends to your party? ---Yes, sure.
---Must I clean the floor now? ---__________. It is too dirty.