用所词的适当形式填空。
A large number of _____ (foreign) visit Guizhou province these years.
Thank goodness! The letter I looking forward to _____ (reach) me at last.
Hainan Island is a ______ (wonder) place to spend summer.
The dinner room must _____ (clean) three times a day.
My cousin is used to _______ (study) with his new friends in Australia.