There was a bridge crossing a big river from west to east. It1a man five minutes 2 it. There was a pavilion(凉亭)3the middle of the bridge with a soldier4. He came out5three minutes.6he saw somebody crossing the bridge, he would tell him to go7, not permitting(限制)him to cross. A clever man thought of a8idea, and crossed the9at last. What10did the clever man think of to cross the bridge?

开辟    开垦

①母亲说：“让它荒着怪可惜的，你们那么爱吃花生，就____出来种花生吧。”

②经过人们辛勤的____，北大荒变成了万顷良田。

固然    居然

③我家屋后的半亩隙地经过开辟，过了几个月，____收获了。

④花生的用处____很多，但有一样是很可贵的。