They will stay there (for )a week.
Talk (about )your trip,please.
Sanya is (in)Hainan Province.
We can learn a lot ( of )words.
We can learn a lot (这个没法填 )about the history (of )China.
Huangshan is famous (for )its beautiful mountains.It's over there,( )the roadIt's over there,(on )the road