为了探究压强大小跟哪些因素有关，老师准备了如图所示的器材：①用钉子做腿的小桌②海绵③砝码④木板⑤盛有适量水的矿泉水瓶⑥装有沙的容器等供同学们选择。同学所选的四组器材中，不能达到探究目的的是( )
A number of children ________ parents had died in the quake were sent to live with families in other cities.
____ ____ advice it is! I like this advice very much.
用下面的词语写句子。
①虽然…但
②奇怪
