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