已知甲数为a×10ⁿ，乙数是甲数的10倍，丙数是乙数的2倍，甲、乙、丙三数的积为1.6×10¹²，求a，n的值．（其中1≤a≤10，n为正整数）

如图所示的电路图中与实物图对应是(   )

①国家权力必须严格按照法定的途径和方式行使

②法定职责必须为，法无授权不可为

③凡不按法定程序行使权力的行为，都是违法行为

④依法规范权力运行，维护群众正当合法利益

根据句意，用括号中所给单词的正确形式填空。
①The new students had always lived with their parents before they came here. They are not used to____  (be) away from home.
②Antonio is liked by everyone because he is always ready ____ (help) others.
③Teenagers should ____  (allow) to go out with their friends.
④We hope the weather will be fine, but it is getting even____ (bad).
⑤He believed his lucky number was 12, so he decided to live on the ____  (twelve) floor.
⑥Timmy has spelt the name____  (correct). That’s why his friend can’t find him easily.
⑦I wonder if there are any____ (suggest) about how to learn English well.