根据语境或句意，用所给词的正确形式填空，并将答案填写在答题卡上指定位置。
In China it’s _______ (polite)to stick your chopsticks into your food when you eat.
My teachers always encourage us _______ (study)hard on different subjects.
Jenny brought two nice ________ (picture)of her family to school yesterday.
The library is between the school and the hospital. You can find it  __________ (easy)
While I _______  (wait)for the bus at the bus station,it began to rain.