Vicky is talking to her teacher about her English.
(V=Vicky; T=teacher)
V: How can I improve my English, sir?
T: Well, the more you read, the better you'll write.
V: And what about my spoken English?
T: Practice makes perfect. Speak English whenever you have the chance.
V: But I don't get many opportunities to speak English.
T: Remember: You'll have to create opportunities yourself.
V: What do you mean by that?
T: You can't sit on your behind and hope that good things will come to you. You've got to go for it.
V: I see what you mean.
T: Good. Now go and put what you have learnt into practice.

go for sth 努力获取
ma'am 女老师   madam(e)(英)
article 文章   essay 专文
opportunity = chance
Don't take that chance. = Don't take risks.   冒险  
Opportunity knocks, but once. 机会只有一次
behind  -- butt 屁股