Дополните диалоги. 
a) Use: the Present Simple or the Present Continuous Tense. - What...(do) you now? -I...(answer) the questions of the Teenagers' Competition at the moment. -Are the questions difficult? -Not for me. We often ...(answer) similar questions in our English lessons.

 
b) Use: the Past Simple or the Present Perfect Tense. -...(take) part in the competition recently? -Yes,I ...(try) my chance two weeks ago. -...(win) you the competition? -No,I ...(not). But it was worth trying.

- What are you doing now? -I am answering the questions of the Teenagers' Competition at the moment. -Are the questions difficult? -Not for me. We often answer similar questions in our English lessons. -. Have you taken part in the competition recently? -Yes,I tried my chance two weeks ago. - Did you win the competition? -No,I did not. But it was worth trying.