Choose the necessary form of the verb: Present Continuous or Present

Choose the necessary form of the verb: Present Continuous or Present Perfect. 1) Wait for me a little. I ( am eating, have eaten ) my breakfast now. 2) Nick ( is writing, has written ) a letter. When he finishes, we shall go to the post-office. 3) Mary (is putting, has put ) plates, forks, knives and cups on the table, so we shall have dinner. 4) Look at the child. He ( is carrying, has carried ) a basket full of plums. 5) Bob (is washing, has washed ) his hands and is ready to help you with the dinner. 6)The family just ( is having, has had ) tea. 7) It is 12 o'clock. Vadim Petrovich ( is having, has had ) his lunch. 8) We already (are doing, have done ) this exercise. Shall we read the text? 9) Tom's sister ( is learning, has learnt ) the English rhyme and now she may go for a walk with her friends. 10) I just ( am walking, have walked ) through the fields.