请根据括号中的中文提示、英文释义或句意，写出句中所缺单词，使句子通顺。
（1）We students should do many after-school (活动).
（2）People in different countries speak different l .
（3）It's (hard or not easy) for me to play basketball well because I can't run fast.
（4）This boy doesn't know the (重要性) of study.
（5）L , he wasn't badly hurt yesterday.
