g and running are the oldest andnewest, excellent _________ exercise for all ages and fitness levels

We feel ourduty to make our country a better place.

依次填入下面一段文字横线处的语句。衔接最恰当的一组是狗是忠义、勇敢而又聪明的动物。 ， 。 ， 。 ， ，使狗成为人的得力助手。①专门训练军犬、警犬，把狗用于军事、案件侦破等方面②它的嗅觉细胞数量是人的24倍，可以分辨大约两万种不同的气味③比如牧民的狗，为了保护羊群，敢于同恶狼猛斗④人们充分利用狗的这种特殊的天赋⑤狗可以听到10万赫兹以上的声音⑥代替主人做一些危险的事

What should parents do when their children have someproblems –I think it’s ____ for them to be therewith their children.

Planning so far ahead _____ no sense — so many things will have changed by next year.