一片青草地，每天都匀速长出青草，这片草地可供27头牛吃6周或23头牛吃9周，那么这片草地可供21头牛吃（　　）周．

依次在横线处填上词语，最恰当的一组是（   ）
（1）又有一次日本作家由起女士访问上海，来我家      ，对日本产的包弟非常喜欢，她说她在东京家中也养了狗。
（2）那时候的青年学子，对梁任公先生怀着无限的      ，倒不是因为他是戊戌政变的主角，也不是因为他是云南起义的策划者，实在是因为他的学术文章对于青年确有启迪领导的作用。
（3）看着这种饲养小姑娘      的制度，我禁不住想起孩子时候看到过的船户养墨鸭捕鱼的事了。
（4）从某种意义上说，在布热金卡，最可怕的事情是这里      阳光明媚温暖，一行行白杨树婆娑起舞，在大门附近的草地上，还有儿童在追逐游戏。

寒假临近，九（2）班同学积极响应校团委的社会实践活动倡议，去敬老院慰问演出。他们所承担的责任是（    ）

    It was a hot summer day. The sun was shining brightly and all could think of was1down with a scoop of my favorite ice cream. I decided to make a quick2to the newly opened ice cream parlor (冰淇淋店) close by for a mid-day3.

    As soon as I arrived there, I 4my ice cream in a fancy cone and asked the server to5two tubs of chocolate ice cream for folks at home.

    While waiting for my take-out, I was halfway through my icy treat and was enjoying the view of the two colorfully6ice cream flavors, sitting pretty one next to the other.

    Now that my to-go order was7, I headed to the payment counter to settle the bill. Surprisingly, the cashier had forgotten to8my ice cream,9only for the two tubs.

    The next few10passed by as I11between doing what was easy—clearing the bill and moving out, and doing what was right—12 the error. I knew if I didn't bring the error in the bill to his13, my ice cream would be charged against his14.

    That moment, my decision was made and I went and told him what he had 15. He looked at me in 16 and thanked me profusely for telling the error. Had it not been for my 17telling the error, he would have been 18. The smile of relief on his face made me smile, too.

    I came out of the ice cream parlor feeling really19about myself. I knew that day how wonderful it feels to do what is right20what is easy.

南方地区主要的农作物有（    ）