Question

1.____you have tried your best,there is no pity at all.

Answer 1

1.now that表既然的意思.有语言环境之其要表达的内容是：既然努力了,就没有遗憾.

2.seeing is believing,固定表达,眼见为实的意思.

3.我个人认为3题最佳答案应该为D,I think这个短语作否定句时要将否定词提前,即I don't think,故排除B,C,need与go均为动词,故中间应加不定式to.

4因为后面eat用的是原型,故助于应为复数,CD排除,又因鸡不吃草,故选B.