def fillcont(x, method):
    data = copy(clean(x))
    missed = nacol(conts(data)); missdf = data[missed]
    if method in ["mean","avg","average"]: data[missed] = data[missed].fillna(mean(missdf))
    elif method in ["median"]: data[missed] = data[missed].fillna(median(missdf))
    elif method in ["mode","freq","frequency"]: data[missed] = data[missed].fillna(mode(missdf))
    return data