1.The day _gets___(get)shorter when winter comes.
2.He is one of China's most famous scientists__alive__(live).
3.The students couldn't help_laughing___(laugh) at his funny story.
4.Ronald began to play for his_national___(nation)team when he was seventeen.
5.A young man_is_practising__(practise) speaking English with some foreigners.
6.Would you like_to go skating__(go skating) with me this afternoon?