小儿生长发育的一般规律有()、()、()、()。
Copernicusmaintainedthattheearth_____roundthesun.
_____youunderstandthisrule，you‘llhavenodifficultyindealingwithsuchproblems.
Thehostsapologizedfor______thatsomeoftheirguestsmightbevegetarians.
Ifyou’resittingaroundalonelycampfireatnight,thehowlofawolfcansoundpretty______.
