___ do you like the book?---  Because it is interesting.

It’s difficult to live in a foreign country, ______ if you can’t understand the language there.

.—How _______the frog(雾) is! We can’t see clearly while riding.

I did my homework very __     ____, so my father looked ___     ___. 

----Wha t do you think of Tom’s speaking? ----No one does      in our class.