根据句意用首字母或汉语提示写出所缺单词的正确形式。

（1）What time do you u________ get up on weekends?

（2）The car is too expensive. I can’t a________ it.

（3）As students, we should know studying hard is ________（必要的）.

（4）Many __________（英雄）lost their young lives for the long-lasting peace of our country.

（5）__________（百万）of foreign tourists visit China every year.