---How often do you have dinner in the restaurant? ---Seldom.The dishes don’t taste so as those at home.
---How long will Tom stay here? ---____.
Hangzhou is one of the most beautiful cities ___ I have ever visited.
___ lovely day they had!
I ___ I could fly to the moon by spaceship one day.
I don't know when he ___. But when he ___ back, I’ll let you know.