def read_txt_file(path):
    """
    Read txt file and return splited words in list.
    :param path: complete file path
    :return: [[s1w1, s1w2, ...], [], ...]
    """
    with open(path, 'r') as f:
        lists = f.read().splitlines()
        lists = [s.strip().split(' ') for s in lists]
    return lists