Why did the author begin to doubt himself after the first year of his writing career?

“Every student should regularly experience the ‘Aha!’— when something you never understood，or something you never knew was a mystery, becomes clear. ”

“置于儿童不能拿到之处。”

在中国一般的城市家庭由三个成员组成——父亲、母亲和孩子。

母亲从不屈服于在我成长过程中遇到的困难。

那次不寻常的经历使鲍勃变成一个耐心、宽容的人。

It’s only a(n)_______meeting，and you don’t have to be in full dress. (formal)

Never indulge in _______as it's harmful to your health. (drink)

我只不过是想关心别人，也希望受到他人的关心，我的要求并不过分。

_______helps one to go forward. (modest)

The professor gave a very _______lecture on the market economy yesterday. (inform)