()my brother ()I am going这句话什么意思?括号里应填哪个介词?求讲解

题目

()my brother ()I am going这句话什么意思?括号里应填哪个介词?求讲解
I could not answer the questions.()I had not reviewed lessons well
这里面应该填because,还是for;()does she write well,()she also speaks well.为什么选not only,but also,是因为后面的谓语动词为复数形式吗?什么时候填both and?

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