Ⅰ、
Regular verbs：
study - studied ， visit - visited ，
seem - seemed ， climb - climbed ，
enjoy - enjoyed ， stop - stopped ，
worry - worried ， taste - tasted
Irregular verbs：
meet - met ，swim - swam ，
buy - bought ， feed - fed ，
keep - kept ， eat - ate ，
see - saw ， read - read
Ⅱ、1、fed
2、keep
3、seemed
4、visited
5、swam
Ⅲ、anyone ， Everyone ， something ， everything ， nothing