usually和often可以互换吗

例句：She felt more than usually hungry after her excursion。远足后，她比平时感觉更饿。They ate, as they usually did, in the kitchen。像平常一样，他们是在厨房吃的饭。I've often wondered what happened to him.我时常纳闷他出了什么事。Try to exercise as often as possible.尽可能经常锻炼。