Only when your identity h___________.

we should exploit the Antarctic’s natural resources is open to discussion

The experiment shows that proper amounts of exercise, if___ regularly, can improve our health.

Time ____ never comes again. So we’d bettermake full use of our time.

下列句子中，全有通假字的一项是①北冥有鱼 ②此小大之辩也 ③幼稚盈室 ④德合一君，而征一国者 ⑤而御六气之辩⑥聊乘化以归尽 ⑦田园将芜胡不归 ⑧常在床蓐 ⑨三餐而反 ⑩祖母今年九十有六⑾乌鸟私情，愿乞终养 ⑿零丁孤苦