十二届全国人大一次会议审议批准了《政府工作报告》,依法选举和决定任命了新一届国家机构领导人员。由此可见 ( ) ①我国人大实行民主集中制原则 ②人大代表享有选举权、审议权和决定权③全国人大决定国家的一切事务 ④其他国家机关必须对人民代表大会负责
—Ben and Sue aren’t home,are they? —No.They _____to London on business.
There are lots of _____that students have to follow in school.
Fresh food is good for you . But you have to ______it first because sometimes it a little dirty.
Ther will be less pollution ___more people use public transportation .
Our teacher was very happy because _____failed the examination.