Fill in the gaps with correct articles where necessary.
... great composer mozart is one of ... most mysterious figures in ... world. He began playing ... piano at 4 and when he was 5 he composed ... serious music. He composed a lot of beatiful works, operas don giovanni, the magic flute and ... marriage of figaro are his famous operas musicians and music lovers say that he was a genius of ... music world mozart's fame was great.

I ( am writing ) an English exercise now.
I ( wrote ) an English exercise at this time yesterday.
My little sister ( is sleeping ) now.
My little sister ( was sleeping ) at this time yestarday.
My friends ( are not doing ) their homework now. They ( are playing ) volley-ball.
My friends ( did not do ) their homework at seven o'clock yesterday.
They ( were playing ) volley-ball.
Are you (  eating ) ice-cream now?
Were you (  eating ) ice-cream when I rang you up yesterday?
What isyour father (  doing ) now?
What was your father ( doing ) from eight till nine yesterday?
Why is she (  crying ) now ?
Why was she (crying ) when I saw her yesterday?
She ( was reading ) the whole evening yesterday.
She ( is not  reading ) now
Now she ( is going ) to school.
What are you (  doing ) now? - I ( am drinking ) tea.
Were you (  drinking ) tea at this time yesterday? - No, I ( was not  drinking ) tea at this time yesterday, I ( was eating ) a banana . 

Im writing an english now
i was writing at this time yesterday
sister is sleeping now
sister was sleeping
friends isnt doing ..now
they playing ...
friends wasnt doing ...yesterday
they was playing
are you eating...now
were you eating yesterday
what are your father doing now?
what was ...doing ...yesterday?
why is she crying?
why was she crying ...yesterday
she was readingyesterday
she is reading now
now she is going th school
what are you doing now . im drinking tea
were you drinking...yesterday?
no i wasnt...i was eating