设a,b为实数，下面四个命题.
①若a＞b, 则a²＞b²         ②若a²＞b², 则a＞b
③若$\left|a\right|$＞$\left|b\right|$， 则a²＞b²     ④若a²＞b² 则$\left|a\right|$＞$\left|b\right|$
其中正确的有(    )

关于通电导线在磁场里受力的方向与电流的方向和磁感线的方向之间的关系，下列说法中错误的是

用所给单词的适当形式填空
(1)I love places where the people are really ____  （friend）.
(2) I want to go there, because I like____ （excite）vacations.
(3) Could you please ____ （give）me some____ （suggest）for vacation spots?
(4) Would you like ____  （drink）some orange juice?
(5) You look tired, why not ____  （have）a short rest?
(6) His brother is considering ____  （study）abroad.
(7) Do you plan on____  （stay）overnight here?
(8) Most private cars ____ （not allow）in downtown Singapore.

下列元素中，最高正价最高的是（　　）

— I can't agree more.