Telling your sorrow to your friends will relieve the pain in your heart. All the words below have a similar meaning with the underlined word, Except ______.

The _________ at the military academy is so rigid that students can hardly bear it.

In China，it is a traditional________to show respect to ancestors during the Qingming Festival.

The old man is ________ enough to contribute $ 10,000 to the disaster area damaged by the earthquake.

—What’s wrong with you, Eric? You look tired.—I ______ to prepare for the final exam last night.