That's the most beautiful place ______ I have ever __________.

- It’s _____ hard problem for the twins that ____ of them can work it out.

My friend and I are       good at biology. But we don't like geography very much.

 --____ has your grandpa lived here?       --Since last year.

--What do you think of Tom？--He is a man of______words. He always stays alone(独自地).