1.Try to read __carefully __ to get the meaning of this article.
2.I don't know how _to use ___ commas.
3.He can't understand ____ English,but he's very good at reading.
4.---I often make mistakes in __pronunciation __.Can you help me?
---Listen to tapes more often.
5.You'd better practice __writing __ an English diary every day.
6.---You look __worried __.What happende?
---There's something wrong with my computer.
7.Can you get the spelling __finished __?