31.So long as you work hard enough,a(an)____rod can be ground into a needle.

A.steel B.stick C.gold D.iron

32.What impressed me most was that they never _____even when they failed once again.

A.lost hearts B.lost their heart C.lose heart D.lost their hearts

31.答案是D,

谚语，只要功夫深，铁棒磨成针。

32.答案是C,

lose heart,泄气，灰心丧气；lose one's heart to sb,爱上某人。