.-Did you enjoy yourself last night?-Yes,it's very nice of you.I appreciated_______to the party.
The best way to prevent the air polluting _____ , but the sky is still not clear.
--- What do you think of _____opening ceremony of the Guangzhou Asian games? ----It was _____magical and memorable sight.
---Why don’t we go to the new Sichuan restaurant for a meal? -----_____
-----_____ leave at the end of this month. -------I don’t think you should do that until _____ another job.
He tried his best to solve the problem, _____ difficult it was.