1 stick to"坚持；忠于；信守"
Set a schedule and stick to it.
制定进度表并且执行.
Keep your chin up, stick to it.
别灰心,挺起你的胸膛,坚持下去.
2 C haven’t had
这里强调到现在为止,故必须用现在完成时态.这个答案不好.
虽然so far也偶尔可以用于一般现在时和一般过去时.但是原句在这里强调“虽然到目前为止我还没有成功,但是我会继续尝试”
So far common sense is right.
到目前为止,这些常识是对的.
No reliability problems so far.
迄今为止没有可靠性问题.
3 greatly“很,非常”,这个副词一般用来修饰动词
His writing has improved greatly in this semester.
这学期他的写作有了很大进步.
I greatly admire your honesty.
我非常敬佩你的诚实.
Her courage greatly moves me.
她的勇气极大地感染着我.
4 none
强调“数量”用none,表示人用no one/nobody.
即none用来对how many/much提问的回答,no one/nobody用来对who/Is there anybody.等的回答.
原句中不是at a hand,而是at hand"在手边,在附近"
这里表示还有一点红墨水,只是不在手边（手边没有）.故不用nothing.nothing表示“完全没有”.
none和nothing的区别.
none
1)既可以指物又可以指人.可与of连用；2)谓语动词用单或复数；3)具体指什么人或物；4)一般用来回答how many +n,how
much +n及含any+n引起的疑问句.请看：
1)None of us have/has seen him.
2)——How many students are there in the room? ——None.
3)——Is there any water in the thermos? ——None.
4)——How much money do you have on you? ——None.
nothing
1)指物；2)谓语用单数；3)一般用来回答含anything的一般问句及what引起的特殊问句.请看：
1)——What is in the box? ——Nothing.
2)——Is there anything in the sky? ——Nothing.
3)——Can you see anything without glasses? ——Nothing.
欢迎探讨词法语法问题.