用括号内所给动词的正确形式填空。

1. He__________(drink)a cup of coffee and began to speak.  

2. Look! The kids__________(swim)  in the river.  

3. Don't go across the street until the traffic lights _________(turn) green.  

4. I hear she__________ (be)  twenty years old next year.  

5. He_________(write) to me as soon as he arrives in Hong Kong.