请问Do you think it's fair?为什么不写成Do you think if it's fair

请问Do you think it's fair?为什么不写成Do you think if it's fair Do you think it's fair that some restaurants are designed to Do you think it's fair that marketers selling on the Interne Do you think it is fair that some restaurants are designed t "Excuse me,sir,but I think it's only fair to tell you that i I think you can do it,it's not d___ do one's fair What do you think ( ) English ?It's difficult but interestin ----Do you think it's going to rain What do you think of the movie?It's very Do you think it`s ture that there are a ( ) -----What do you think of l______in China?-----It's wonderfu