Article in English is an important part in English Language, it gives the main point in the sentence.
Now study with me to check your knowledge about article
Remember. 
You must add "a" if the first letter in the word is Consonant Letter
and You must add "an" if the first letter in the word is Vocal Letter

Insert a or an if necessary.
1 My neighbour is . . . photographer; let's ask him for . . . advice about colour films.
2 We had . . . fish and . . . chips for . . . lunch. ~
That doesn't sound . . . very interesting lunch.
3 I had . . . very bad night; I didn't sleep . . . wink.
4 He is . . . vegetarian; you won't get . . . meat at his house. He'll give you . . . nut cutlet. ~Last time I had . . . nut cutlet I had . . . indigestion.
5 . . . travel agent would give you . . . information about . . . hotels.
6 We'd better go by . . . taxi. if we can get . . . taxi at such . . . hour as 2 a.m.
7 . . . person who suffers from . . . claustrophobia has . . . dread of being confined in . . . small space, and would always prefer . . . stairs to . . . lift.
8 Do you take . . . sugar in . . . coffee? ~
I used to, but now I'm on . . . diet. I'm trying to lose . . . weight.
9 . . . man suffering from . . . shock should not be given anything to drink.
10 You'll get . . . shock if you touch . . . live wire with that screwdriver.
Why don't you get . . . screwdriver with . . . insulated handle?