certificate <> certification e.g. I don't thing further education is nessesary, you could just get a certificate. ( or certification?)

How do you guys overcome the huge English vocabulary? Though to hold a large vocabulary is not the ultimate goal, it seems really important to me, an intermediate English learner, to know more new words. I just opened a wordlist of 6,000. By skimming the wordlist, I guess there were around 1,000 words that I didn't know... so frustrating... On the way to be a fluent speaker, there seems to be a ton of new words right there waiting for me. Guys, how did you gain the huge vocabulary? Could anybody give me some tips, thanks!

How to improve my pronunciation? I've leant English for ages, but it wasn't until 2 years ago that I began to learn it seriously. Now I think I'm OK with common conversations, but it's still a little hard for me to listen to BBC, VOA news. When talking with native English speakers, I just find they speak so fast! And my pronunciation is poor compared with theirs, understandable though. For the time being, I'm keen to improve my pronunciation, but how to? Thanks!