1. A）根据句意及所给汉语提示，写出句中所缺单词。

1. （1） Let's meet at a(n)(一刻钟)past three this aftemoon．
3. （2） Mr．Wang often helps me with English at(晚上)．
5. （3） It's good for us to(步行)after dinner．
7. （4） His father works at a radio(电台)．
9. （5） Our classroom is always tidy and(干净的)．