Fill in the blanks with the suitable prepositions or adverbs.(填写适当的介词或者副词,使句子完整) 1. They arrived ________ a small village before dark. 2. The teacher put up a picture ________ the wall. 3. We visited the old man ________ Sunday afternoon. 4. We went to swim in the river ________ a very hot day. 5. The policeman was surprised ________ the news. 6. The manager was very satisfied ________ his work. 7. There is an old stone bridge ________ the river. 8. It was good ________ you to help my little boy. 9. My parents were very pleased ________ my studying. 10. This is a good dictionary ________ English grammar.