He should have been warned of the danger.—_______, but he wouldn’t listen to me.

填在横线处，与语段含意最为吻合的一项是（ ）， 。古今有识之士治学都很注重“博观而约取”。观而有选，取而有择，有的放矢。韩愈在《原道》中批评有些人读书作文“择焉而不精，语焉而不详”。袁枚在解释杜甫诗句“读书破万卷，下笔如有神”时说：“盖破其卷，取其神，非囫囵用其糟粕也。”爱因斯坦则说：“在书本中找出可以把自己引到深处的东西，把其他一切统统抛掉，抛掉使头脑负担过重并将自己诱离要点的一切。”这些真知灼见，发人深思。

When I came back, I found my bicycle __________.

I just don’t understand_____________ that prevents so many Americans from being as happy as one might expect.

─ do you help your parents do the housework ─ Every evening.